Originally an insult, TWAMP (Typical William & Mary Person) was once used to describe the nerdiest of nerds at William & Mary. However, because the entire student body, is in fact, a friggin nerd, the term has been hijacked by students and now applies to the entire student body. If you've gone to school at W&M, you're a TWAMP. Sorry.
Sam: "Yo I spent 8 hours in Swem last weekend"
Alex: "STFU dude stop bragging about how boring your life is...fuckin TWAMP"
Sam: "Takes one to know one"
Alex: "Yeah but I remember the first TWAMP urban dictionary definition, you do nothing but go to the library every day"
Sam: "TWAMP had an urban dictionary definition before this?"
Alex: "Jesus you're helpless, go drink a beer kid"
Sam: "But I'm 19"
Alex: "Exactly, fuckin TWAMP"
by treeeeeeeeeeeeeeeeeeb December 21, 2021
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A sac-o-weed that costs $20
'We bought a twamp, loaded up the bong, and puffed away'
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20 Dollars worth of weed, a 20 sack of weed
Boy 1: Want to buy this twamp?
Boy 2: Nah man i got an 8th at home.
Boy 1: aight, Peace
by bigremo907 April 1, 2007
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formal definition: one gram of marijuana costing $20.

other uses: often used to refer to sack (of any size) costing $20. and sometimes to refer to a 20 dollar bill.
Pancho's been paying a twamp for them twamps. Guess no one told him 'bout them eighters or better yet them nor cal half eighters at a 20 spot. fool needa recanize.
by Androp September 24, 2006
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Twamp Means 20. Doesn’t have to do anything with weed or money it simply stands for 20.
Commonly used by inmates, “I am serving a twamp for armed robbery
by Grateful Grace July 31, 2022
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