(n) Someone who posts on an internet message board in ardent and blind support of someone or something. Generally used for people posting on stock market message boards, and encouraging others to by the stock.
Beware the pumpers on the MSFT board.
by keyshaw June 3, 2004
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A person who remains out in the street, or in a certain location, for the purpose of selling drugs.
I'm pumpin' just like a pumper do. -rapper Jim Jones
by illogiks January 9, 2008
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A person who remains out in the street, or in a certain location, for the purpose of selling drugs.
I'm pumpin' just like a pumper do. -rapper Jim Jones
by illogiks December 11, 2007
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someone who loves to pump their penis into a tight pussy
I am a pumper
by PumpMasterCunty April 8, 2003
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word for steroids aka arnorlds
That mofo gotta b using some pumpers.
by MIG December 26, 2003
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annoying ass people at dances, all they do is fist pump and get in other peoples way when they are trying to get their twerk on. they all also called anti-twerkers. sometimes try to start a train when other people are too busy twerking.
Jason: How was the dance yesterday?

Dennis: It was horrible, fist pumpers were blocking my girl and me

Jason: That sucks. Well I was throwing my hands in the air and grinding on a girl while some guy was trying grind on me

Dennis: Dude, I think you were the fist pumper

Jason:..........
by "Brian Bui" December 18, 2012
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Someone who has sexual intercourse with a dwarf or midget.
We need to find a midget pumper to bone up this midget.
by det.und July 30, 2005
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