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The leftover urine that drips onto the pants or shorts after zipping up, giving the impression that one has pissed himself, or the water from a faucet that somehow ends up on said parts. Runoff is commonly hidden or removed by wearing long shirts or utilizing the hand-dryer while no one is around.
Bill: Oh hey man looks like you just pissed your pants!

Sven: F*** runoff!
runoff by Waldosziak May 24, 2012
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Runoff is usually for science, and runoff is used by a mountain. The running of water from the pure land up top.
The runoff from the mountain transferred to the rocks due to the water transition.
Runoff by Shoto_X_Froppy February 26, 2020

Runoff Pussy 

(In particular college girls) A girl that lingers around a campus trying to fuck “something”. These girls are usually “beat”(see term) and have just finished a night full of binge drinking and other illicit activities. BE WARNED: these girls are scary and usually make a habit of this so make sure to wear a “hat” (condom) if you plan on indulging in some Runoff Pussy.
Used in a sentence: Damn dude that Runoff Pussy last night was INSANE!
Runoff Pussy by CokedOutSmurf October 2, 2011

runoff stress 

overbearing, fatiguing strain and tension due to supporting a friend during a period of distress and emotional or personal turmoil
Elizabeth was so worn out from helping Ariana deal with her breakup that she was beginning to let her own life fall to pieces due to all the runoff stress.
runoff stress by Kievyn March 8, 2007

Runoff election 

A good name for an election, since the winner gets to run off with the money.
This year a black guy and Jew get to do the same thing thousands of WASP's did before them, run off with the money after the runoff election. Everybody seems to make a big deal of it, the same way they would do if it was a transvestite who started life as a female Christian then converted to Islam and had a sex change in his/her/it's 20's.
Runoff election by Solid Mantis January 15, 2021

Hipster Runoff 

Probably one of the best blogs on the internet, because it's a bunch of hipster hating hipsters, and they're cool because they can take a little joke about themselves,

Made by Carles, but no one really knows who Carles is, a girl or a guy, old or young, etc. We don't know.
Hey did you hear about how Best Coast insulted Hipster Runoff ?

anal runoff 

Sperm that leaks out of an anus that has just been ejaculated into.
Alisha's pregnancy is a result of anal runoff.
anal runoff by anusbeed April 2, 2010