Top Definition
The result of lighting farts (methane gas expelled from the body due to digested food) without the protection of trousers or pants, causing in some cases burning of the ring piece.
Tubby lit a fart while naked and burnt his arsehole, flames shot from his ass. the anal fire was seen for miles.
by JR in guersney April 04, 2006
When you shove a piece of paper in a persons ass, light it on fire, and woff the smell to get high. Occasionally done with friends in a meeting when you

sit in a circle in a dim room.
Tom is being the victim of anal fire tomorrow
by Pinchofsalt9000 March 18, 2015
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