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1.
Originally derived from the phrase, "Do you know what I'm talking about?". When said lazily and mumbled together, the phrase can be compressed into "tumba".
Person #1 says, "Don't you hate it when you are wearing jeans and you're driving down the road, and your butthole starts to itch but you just cant get to it?"

Person #2 replies, "Tumba"
av E_Bola Virus 13 mars 2009
 
2.
A female's large posterior, a big booty.
From the spanish slang "tumba-burro", meaning donkey dropper, better known as a car bumper.
Damn, did you see the tumba on that female?
av bigRich 12 januari 2005
 
3.
a fat chick... plain and simple . a fat female
eww did u see that nasty tumba check out my pizza.. get back bitch its mine!!!
av annmayela 22 juni 2005