anal burp 

1. To expel intestinal gas via the anus.
2. To literally burp with your butt.
3. The act of farting on another person.
4. To have a "normal" burp (gas leaving via the mouth) smell like fecies.

Patrick had an anal burp and the room smelled like rotten eggs.

The onion smell that came from that girls mouth was so vile, it was considered to be an anal burp.

anal burp by F. Harris September 14, 2006