When having sex with a girl missionary style, you pump 25 times, dump your vomit, then run.
Yesterday i was 25 pump and dumping on this girl and now i think she hates me.
by Logofresh April 27, 2016
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When a dude takes forever in the bathroom because he masturbates then poops while on the toilet.

dump pump masturbate
Tyler was in the bathroom for a good 20 minutes he must've been doing a dump pump.
by chicks_knowthe#truth March 8, 2019
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The act of using a giant fleshlight while simultaneously taking a monumental bowel movement
Alright fine, I'll play some Mario Party. Just let me go pump n' dump first
by koonmagic November 28, 2010
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n. The act of masturbating in a gas station bathroom while defecating.
Steve: "Dude, pull over at this gas station. It's urgent."
Jeff: "Why?"
Steve: "I need to take a Pump 'n Dump. Bad."
Jeff: "A what?"
Steve: "Look it up."
Jeff: (searches Urban Dictionary) "Oh my god that is horrifying. People do this?"
by PriceIsRight November 24, 2013
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The companion technique to the blumpkin. Intercourse (usually anal) performed while the pitcher defecates is referred to as a pump n dump.
I was giving her the ol' Pump N Dump, right before I finished that shit off with a blumpkin.
by Sp0o/\/?! May 9, 2008
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When there's been a lot foreplay and it only takes two pumps of a penis to get them to cum
I was with my date last night and it ended with a two pump cum dump
by Cake.is.my.otp August 18, 2017
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When you catch your 10 year old cousin blasting rope to fortnite porn at 3:27AM, so in response you join him.
Last night me and my cousin did a double pump cum dump!
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