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1.
Another word in portuguese meaning "shit".
Isto é uma bosta (=This is a shit)
by Dju September 05, 2006
 
2.
a small and furry cute animal that defies all laws of cuteness.

or, a slang word for best friend.
dude your cat is such a bosta cat.

hey bosta! whats up?
by davitron October 04, 2008