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1.
A case or series of cases of diarrhea that is so nasty, wet, and/or painful that going to the bathroom feels akin to throwing up from your ass.
Boy: I was sitting on the toilet last night, and all of a sudden everything rushed out at once. It was so traumatizing that it reminded me of throwing up. It was like...

Girl: ...anal vomit?

Boy: YEAH! Man, do I love you.

Girl: That's disgusting. We can't be together anymore.

Boy: What? No! Don't leave me! I NEED YOUR SUPPORT NOW MORE THAN EVER!
de middaymoon 30 mars 2008
 
2.
1. A REALLY bad case of multicolored diarrhea.
A: Dude, I totally couldn't sleep last night.
B: Why?
A: I had anal vomit for like three hours. My bathroom's destroyed.
B: Is that why you're walking like a cowboy?
A: No... *cough*
de Cola J 18 mars 2008
 
3.
also know as diahreahha. when your anus no longer spits put logs, but spews a fountain of foul filth in an almost purely liquid state.
"Man i went to that shady Mexican resturaunt and had their burrito grande. It tasted okay, but I've been anal vomiting since!!!!"
de tiggerus 10 février 2010
 
4.
Band from the late 80's and early 90's located in south Florida, mostly Boca Raton based. Band members known as "Dirties" wrote and performed their music while making fun of existing musicians and songs
Anal Vomit Songs including: Haitians, Big fat rubber double headed dildo
de A Dirty 31 octobre 2013