An unattractive and uninvited guy who attacks from behind and attempts to dance and/or grind on your ass while you are dancing with your girls.
Better spray the DEET tonight...you look so hot you're gonna attract an Ass Fly.
by ~Limerick Queen January 05, 2009
A common, and derogatory, nickname for the fundamentalist, home "educator" and founder of Conservapedia, Andrew Schlafly.
-Hey this history exam has 15% fewer questions if you're a girl.

-That's because it's written by Assfly.
by A Pedant November 28, 2009
Something that makes someone irritable and uptight.
What's his problem? Looks like he's got an assfly up his butt.
by blueguitar69 August 15, 2007

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