when a guy cums in a chicks mouth and then the bitch makes out with him...nasty shit..thats what it is...

When a guy shoots a line of jizz on the mirror and the chick snorts it.

Felatio performed amidst a flurry of dandruff that was kicked up by the performer going through the motions.

Seeing is believing

When the Girl/Guy giving head eats something cold( like ice cream) before going down.

When you look up at the guy you just blew with a mouthful of cum and he punches you between the tits and you explosively blow it back at him.

The act of spitting the cum that your partner unexpectedly deposited in your mouth back in his mouth. Some people may like this, but, in general, it is thought to be an act used to get back at a guy for cumming in your mouth without warning.