Originally slang for male homosexual, but the phrase has been used so widely (mainly by second-graders)that it now can mean almost anything.
by Ben Carmitchel, IL April 25, 2003
 Get the fart knockermug.
Get the fart knockermug. Reference to anal sex, basically a variant of "fudge packer."  Usage hijacked and generalized by the Beavis and Butthead show in the 90s.
by Janet90232 October 24, 2007
 Get the fart knockermug.
Get the fart knockermug. by Saint Shaggy November 5, 2002
 Get the fart knockermug.
Get the fart knockermug. One who farts on his neighbor's doorstep, knocks and then runs away leaving said neighbor in smelly ass cloud.
by Dr. Evil December 3, 2003
 Get the fart knockermug.
Get the fart knockermug. n. 1. one who knocks farts 
2. one who has the ability to penetrate gas with solid
3. one who can walk through a green cloud with no ill
effects
4. one who thinks he/she has discovered a door, only to
realize later that it was a fart
5. a brown, smelly ghost
6. one who uses: lol, ur, prolly, teh, etc.
2. one who has the ability to penetrate gas with solid
3. one who can walk through a green cloud with no ill
effects
4. one who thinks he/she has discovered a door, only to
realize later that it was a fart
5. a brown, smelly ghost
6. one who uses: lol, ur, prolly, teh, etc.
Bruce: Knock knock.
Bob: Who's there.
Bruce: Fart.
Bob: Fart who?
Bruce: Fart Knocker.
Bob: Fuck you.
Bob: Who's there.
Bruce: Fart.
Bob: Fart who?
Bruce: Fart Knocker.
Bob: Fuck you.
by camp lickalotta March 13, 2008
 Get the fart knockermug.
Get the fart knockermug. It's "YOU'RE" not YOUR, you fart knocker.
You're means you are, fart knocker.
See Beavis and Butt-Head for more insults.
You're means you are, fart knocker.
See Beavis and Butt-Head for more insults.
by Craig April 6, 2005
 Get the fart knockermug.
Get the fart knockermug. 