I just learned about a new type of sex act (it may not even be humanly possible – that’s what I wanted to ask about), and be warned, it’s disgusting. Like, test the limits of decency, and of keeping your lunch down, disgusting. Is there a threshold at which a topic is just too disgusting to talk about in FQ?
I cannot answer your question. I am now intensely curious however.
I am not a mod and don’t know the rule, but would a NSFW or a “Brain Bleach required” in the title and white space so it doesn’t show on a preview suffice?
Doesn’t sound like FQ material. Try Politics&Elections, that’s full of stories about disgusting behavior.
Well-played.
No, there’s no rule that limits how disgusting a topic can be. This is the board where we’ve discussed pan-fried semen, after all.
That said, the thread title should be safe for work, and you’ll probably want to follow the typical NSFW guidelines (put the disgusting descriptions inside spoiler tags and warn people that the spoilered text is very much NSFW). You’ll want to make sure that it takes two clicks to get to the disgusting stuff.
A “brain bleach required” warning as suggested by @Saint_Cad would also probably be appreciated, though it’s technically not required.
The filler worked to push things down so mouseover over in the FQ list didn’t preview the NSFW part. But the auto-preview here included what you didn’t want to be seen.
Moderator Note
I changed the link to remove the preview.
Is it possible to change the link to remove the memory of the preview? 
Level with me. Should I click that link?
Here. This may help.
I’m a very curious person by nature but I’m not clicking on that link.
I’ve also never seen “two girls one cup”.
I appreciate the OP of this thread asking how to do this in a sorta discreet way.
Me neither. After telling me it was not too bad and giving a vague description, some friends showed me Goatse. Yeah, not pleasant or appetizing, but not too bad.
Another firiend gave a very vague description of Tubgirl. I made it clear I did not want to see it. He tried to change my mind. Eventually he gave up and we were looking at your average websites. Then. he pressed some key to minimize everything but a picture of Tubgirl.
That was about thirty years ago. I still have not forgiven him.
I have to confess that the OP’s post got my interest, so I chose to go and view the Urban Dictionary entry.
I was disappointed. Sure, it’s gross, but in an age that spawned Human Centipede and two sequels, I’ve become quite jaded to so-called “shock videos” and things of that ilk. I mean, in my mind, I’ve considered grosser and more depraved things. Not necessarily sexual in nature, but more of hypothetical, “I wonder if” scenarios.