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1.
A morbidly obese female. She would be reminiscent of the character in "The Lion King", by the same name. The word may also apply to men, but mostly females. In dating sites they may consider themselves to be a BBW.
Oh man, I woke up this morning next to a poomba. I really should stop drinking so much.

Hey man, look at the moo-moo that poomba is wearing.
by charolastra1977 March 09, 2010
 
2.
An action where one person accidentally spits on another person while talking.

It is called this because if one says the word "poomba", spit flies out of the mouth.
"Do you like purple pickles?"

"Dude. ya just poomba'd on me."
by PurplePickless December 25, 2009