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2.
The big toe. Largest of all that is toe.
Paige: Whats wrong???
Katie: I stubbed my tumb the other day.

My tumb hurts.
by Paigeroni October 12, 2005
 
1.
a word used for the sole purpose of the song "Colt 45" most likely a measurement of marijuana
colt 45 and 2 zig zags baby thats all we need
we can go to the park after dark and smoke that tumb of weed
by guanaria June 27, 2011
 
3.
tall and dumb
kiara- wow! she's tall.

amanda- wow! she's dumb.

taylor- wow! she's tumb!
by so_hows_life May 12, 2009