This means anyone who is a knee-jerk Neocon, a rude person, someone who has no filter between the brain and mouth, someone who likes to dis people they consider "inferior" to themselves. Someone who has chronic diarrhea of both the brain and the mouth.
Tom: "I can't believer Bill stiffed her for the tip."
Doug: " Yeah, what an asspump."
by Jimbojones 55 March 31, 2010
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A man who''pumps'' or thrusts his penis into a man or womens anus, Or if the women has a penis(fuckign wierd) can thrust it into another man or womens.
Johny is sure a asspumper, that faggot.
by ErikTHEstonerDUDE August 11, 2006
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