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.
by Roger Simmons January 3, 2006
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The sexual act of thrusting objects in and out of a ladies Front Bottom or rusty bullet hole or the aforemantioned of a man. Can be a act of self particpation or shared with a partner of group.
Michael was keen to experiment in the bedroom department. Jane too. Although the act of pumping will not be revisited after Jane returned the compliment.
by WaterBoy June 19, 2006
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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."
by Soiled Undergarment August 17, 2003
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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.
by ManofG November 30, 2007
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N - The opposite of moshing. A group of guys and girls that grind and make out, sometimes going all the way in the crowd at a concert. Usually during raves.
Dude #1: I'd rather go Pumping at a concert than Moshing.

Dude #2: Dittto, better to make out with hot chicks than rub all over sweaty guys.
by Pyre Punk February 10, 2011
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