Someone who is dummy thick; bootylicious; juicy thighs

Aka big booty judy
Damn this thummy has some thick ass thighs
by thummy thummy February 25, 2020
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While it may seem the phrase just swapped letters from “dummy thick” a thummy dick refers to a penis as the shape of the thumb. A fat penis.
Wow! Jerry’s got a thummy dick! It was fatter than the roundness of this Earth!
by HeadReciever22 July 26, 2019
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Getting a girl to put their thumb up your bum while she tosses you off
Thummy Bum Wank............... Ahh babe... put it in there, but make sure you keep your rhythm
by Nizzlebizzlenizzle August 19, 2011
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Stupid people who get in everyone's way because they are texting while walking or driving.
The two thummies ahead of me made it impossible to get to the subway station before my train arrived.
by Red Queen June 12, 2015
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