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A slang term commonly used amongst Bodybuilders to refer to the feeling in which blood is 'pumped' into the muscle for support during overload causing it to expand in size and becoming tight, thus being 'pumped' up.

Famously compared to cumming by Arnold Schwarzenegger in the classic Bodybuilding documentry "Pumping Iron".
The most satifying feeling you can get in the gym is the pump. Let's say you train your biceps, blood is rushing in to your muscles and that's what we call the pump. Your muscles get a really tight feeling like your skin is going to explode any minute and its really tight and its like someone is blowing air into your muscle and it just blows up and it feels different, it feels fantastic. Its as satifying to me as cumming is, you know, as in having sex with a woman and cumming.
pump by Roger Simmons January 3, 2006
Related Words
1) A pump action shotgun.
2) To fill your car with petrol.
3) To ejaculate with plenty of force.
1) "Dude, that is a nice pump."
2) "Dude, wait in the car while I pump."
3) "Dude, I was so horny I was pumping like mad."
Pump by Soiled Undergarment August 17, 2003
To break wind. A slang term from England that isn't used that much anymore because "fart" is more widely known and the word usually comes to mind quicker.
Pump by ManofG December 28, 2007
Doing something with a very high level of enthusiasm or awesomeness. Also can be referred to as PUMPing weights.
Terry: How'd you do on that math test?
Tim: I PUMPed right through it.

Frosty: You look fresh today dawg.
Liquid: I PUMP all day, everyday.
PUMP by Liquid All Day April 6, 2011
To get jiggy with someone; the act of having sex with another person or object(a cone for example)
Pump by John Matt June 19, 2003