We just all preferred the f-word or boning and didn’t care if there was another.
Any unwanted residue from eye, ear or skin on the face is facemegma. Pronounce it “face smegma”.
This thread is getting hijacked by people talking about the fact we have no non-taboo words for taboo things (which is inherent) when the topic is “things we have no word for”
We have heaps of words that mean sex and defecation but those subjects are taboo. Consequently, any word we use for those actions will be euphemistic, impolite or highly formal. If you were to think of a new word for those things intending it to be non-euphemistic, polite and informal, it would come to be seen as impolite, because it isn’t polite to talk about taboo things. This is not a feature of the words, it is a feature of the subject matter, and consequently entirely unavoidable. But the fact that we have no polite/non-euphemistic/informal words for such subjects does not mean that we have no words for them. So they don’t fit the OP.
What about that thing we do when we want to imply that someone is nuts, and so we use our finger to flap our lips, making a b-b-b-b-b-b-b sound? I’ve tried to find an example on YouTube before, but what do you search?
I’d love to see the archaic word “hurple” make a comeback: The act of hunching up one’s shoulders in reaction to fear or cold.
I think we need a single-word expression for the opposite of being “in a hurry” or “in a rush.” Like when you have a whole lot of time to kill. So instead of saying “I’m in a rush,” you can say “I’m in a ___,” meaning the opposite of being in a rush (you’re trying to find ways to kill time.)
I think “have sex” really is what we use for this. It pings pretty “non-vulgar” to me. As Princhester pointed out the subject is weighted so it’s pretty hard to unweight it no matter what the verb, but “have sex” comes the closest to being unambiguous, unshocking and unclinical.
If I had to tell a doctor about something concerning that happened while having sex that’s how I would say it. I wouldn’t say “While my husband and I were copulating…” or “procreating…” or “fucking…”
I guess you don’t like that it needs a helping verb but lots of verbs do.
Meeting and/or getting to know someone online, Email, etc. - in which you haven’t literally ‘met’ each other.
Subsequently, the opinion you form of someone from their ‘persona’ that you perceive from their posts in a message board or social media.
Why? You already found a great expression to use. If you say “I am killing time”, that’s four words, the same as “I am in a ___”.
This thread does seem a bit concerned with having a single word for something. Sometimes, our names for things involve a couple of words. That’s just language for you.
You have a good point there.
Thai has a single-syllable word for this, an example that popped into my head when I saw thread title.
Thanks. I also can’t count, BTW. “I am in a " is *five *words, versus four in “I am killing time”. Meaning that you can even have “I am *just *killing time” for the same number of words, which is even better. Although, depending on how long your hypothetical "” is, you might yourself save a syllable there. Still doesn’t seem worth it, though. 
I’m in a lull.
Here’s another “action” one.
If we want to visually indicate that something or someone is a bit screwy, unbelievable or otherwise off — the action equivalent of “Oh, brother!” — we say “rolling one’s eyes.”
But we don’t have an equivalent phrase for the action of quickly pointing one’s eyes to the side to subtly indicate (to the observer) the unexpected or unknown presence of someone else in the room.
Say I come through the door of my friend’s house MF-ing loudly over some misfortune that has befallen me, but I don’t realize that my friend’s grandmother is in the front parlor. My friend doesn’t want to be so obvious as to make a sound or a gesture to shush me, but does a quick movement of his eyes in the direction of his grandmother.
What’s that called?
Looking askance
I did find one dictionary that gives a secondary definition of “askance” as sideways.
But I’ve never heard this term used without the implication of disapproval or suspicion being a part of it. That would not really be the case in my scenario, where the sideways glance would simply be an alert signal.
“I’m killing time” is just 3 words (if “I’m” is one word.)
Hmm, that might work. 
E-cquainted.
E-steem.
Or, if in the Pit, E-steam.
Right, but it’s an alert signal that you’re disapproving of the behavior at the moment, it’s kind of an interesting blend of the two definitions, IMO.