When you put the homies cock in your mouth and start flexing all of your throat muscles, causing him to bust so hard it blows out your spinal cord, killing you instantly.
A cliff at dolime quarry in Guelph Ontario. The name came to be when some drunken idiot (read: typical cliff jumper) tried to spray paint "Jump In" but managed to spell "Gjump In" which has now been shortened to "gumpin". A gumpin is also a measurement. 1 gumpin = ~25ft
a gumpin is not a static measurement because a gumpin is defined as "the distance from the top of the cliff to the water" thus a gumpin is never the same.
S: I dare you to dive off the gumpin!
T: I dare you to gainer the gumpin!
S: I dont know how to GAY-NOR
T: It's "gainer" not gaynor, you fucker.
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I answered my physics test in gumpin lengths.
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Dude that cliff is like 3/4ths of a gumpin.
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Gumpin is pronounced "Guu-om-pin"
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the amount of water in dolime quarry is 36 gumpins cubed (i.e. 36g^3 opposed to 300m^3)