Come live with me for a few days. You’ll find out 
I can cum in my own mouth - how’s that?
Could do man, *could *do. Not can do. Now try crapping in your mouth while doing a wrestlers bridge. That would be something.
Oh - in that case I don’t get this thread.
Picking scabs from one’s ass? Putting on a Modern Talking CD and turning the volume to max, making the whole neighborhood nauseated? Or perhaps being mean and arrogant (instead of giving constructive criticism) to a 1337 5p33k1ng kid on the internet?
Seriously though, cut him/her some slack.
Why do you know that?
Felching was popular around here for a while. I always found it kind of meh but some others thought it was distasteful so that may qualify as a provisional entry.
Another vote for felching. Do it all you want in private, but please don’t tell the whole world about it in detail.
And some more things…
Apparently, some people pop their pimples in public. I haven’t witnessed that personally, but yuck.
What I have witnessed though, was someone a. talking with food in their mouth and b. loudly talking about someone bleeding out their ear…on a family reunion, at a nice restaurant. I was eating a dish with a red sauce. Thanks, [Elderly Relative]!
Eyeball stabbing.
I accidentally a whole carp. Is this bad? 
Indeed. A cut-up eyeball is one of the most painful (if the “victim” is alive) AND most icky things I can think of. I remember in grade 9 in school, in biology class, we had to dissect cow eyeballs. I had to temporarily leave the room 'cause I was queasy. No, I didn’t barf, but I sure would have, had I stayed in the room with the bovine eyes even a few seconds longer. Was it the sight or the smell? Probably both.
Chillidog, but then again, I have a weak stomach.
SSG Schwartz
Chilidogs, with the lab crew after doing a day in the lab, running scatological analyses. 
“Oh, man, that looks just like sample #235-8. Does it taste as good as it smelled back in the lab?”
I had a cat who loved to eat trout eyeballs. As soon as my ex or I started unwrapping it to cook, she’d be right there, begging.
Er, cos I’ve done it? I think most flexible gay men (and some straight ones) have.