When you and your friends are passing around a bong, and Y'all smoke the top layer of the weed. The Underweed is all the smokable weed under the burnt top layer in the bowl.
Don't forget to smoke the underweed at the bottom of the bowl!
by Brazybinch September 21, 2017
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One's undergarments.

Such as: Tanktop, Bra, Tighty whities, Boxers, and the infamous Panties.
Woah! Did you see her underwees? They are so sexy!
by Some kid who is weirtd October 29, 2017
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