1. A long, often tiring process with repeated actions and many steps until you eventually reach the finish.
2. Whacking off
"Man, I was proofing all during geometry class, and now I can hardly think straight."
by Schlang (inspired by KenCon) November 16, 2006
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A useless geometry tool taught by teachers to piss you off emensely, and eventually, fail you.
Teacher: Please now make a proof table to show how you got your answer.

Student: Bitch!, the answer is right! Why the fuck would i need to show how i got my answer with a PROOF?
by Killagriffin December 12, 2010
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You need these to prove an accusation to be true. Proofs must be physical, and witnesses are NOT proofs.
Dude 1: "Your breath smells so bad! Brush your teeth!"
Dude 2: "My breath smells great, you have no proofs!"
Dude 1: "Literally everyone can smell your bad breath! There are so many witnesses."
Dude 2: "UM, WITNESSES ARE NOT PROOFS!"
by NoYouMan May 11, 2017
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R.I.P. Proof, friend of Mr Mathers, rapper in D-12, was shot and died in the early hours of Tuesday morning on April 11th 2006. May he rest in peace.
Proof will be greatly missed. Loved and respected by many, the loss of this fine rapper is a loss to us all.
by marshall313mathers April 12, 2006
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to consider someone as a person you would date if they asked you out; to be interested in dating a person without obssesing over them
"There are a couple people I'm proofing right now, but mostly Julia"

-Do you like him?
-No, thats pathetic. I'm not obsessing over him I'm just proofing him.
by JuliaMakesDefinitions! October 19, 2009
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another slain rapper of the rap game and another slain rapper of d12 he was and always be one of the greatest to ever grace the rap game and will be missed R.I.P Big Proof AkA Dirty Harry The Rap Mayor OF Detroit.
out of towner: whoz the rap mayor of detroit
Detroit: PROOF!
by kon Arti$ April 17, 2006
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