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1.
No; Probably not.

Contrary to popular belief, Proll actually means NO, it does not mean probably.
Rich: Yo you goin to the game tonight?
Cory: Proll
by Lingo Larry January 18, 2011
 
2.
Probably.
Is it a good time to buy stocks?

Prolls. This is one of the best bottoming periods yet.
by Luke2k July 20, 2008
 
3.
meaning pussy. manly used when referring to getting some.
damn son she wouldn't even throw up that proll after i took that bitches ass out
by Bryannn June 07, 2007