Decaf is word used to describe a person who is just as stupid as decaf coffee. With no flavor or purpose they are completely useless.
David: dude, why don't you like that chick?
Kevin: because she is a fucking decaf!
by Decafhostess March 27, 2014
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A slang term for a particularly masculine lesbian. Implies that she is without estrogen, or "decaffeinated".
Person: Ew is that a lumberjack?
Other person: No, it's just Jen. She's decaf.
by Duracell December 8, 2006
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Check out the decaf.

You're fucked up.

When's her birthday haha
by Eric Luz April 12, 2017
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A mf who DOESN'T drink coffee or any caffeinated beverage
That Decaf Mf only drinks water
by Queen Athénaïs March 15, 2023
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A person who is so boring they make you yawn
P1: Josh was such a decaf person I thought I was going to die of boredom

P2: Lol what'd he do
P1: He didn't do anything literally

P2: oof
by 131313131313131313131313 April 9, 2021
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Saying used to tell someone to chill out or calm down. Usually used when dealing with overly energetic annoying people.
That guy Sal at the party just wouldn't shut the fuck up and kept talking over everyone, so I told him to "switch to decaf" or leave.
by flyindutchman April 9, 2015
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When, unbeknownst to you, the regular coffee pot at work actually contains decaf coffee causing mid-morning head nods, yawns, headaches, and sluggishness.
I would have finished that assignment this morning, but I couldn't because it turns out that I was decaf poisoned. I fell asleep at my desk!
by coffeegirl678 August 23, 2011
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