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1.
One who balls like a pro. If someone is baller at absolutely anything, he/she has the right to call themselves a pro baller. A pro baller tends to be "the shit".
Jon: "Nirman makes everything hilarious!"
Frank: "Yeah, and he a beast on the court."
Jon: "What a pro baller."
by 333221 October 31, 2011
 
2.
A paintball term, used for someone with exceptionally good paintball skills, and one with a awsome paintballer marker, most proballers shoot ICD markers, and most of the time they really never play, they just play 2-3 times a year and somehow "own everyone" on the field.
"That proballer with the b2k2 WITH PDS, just owned the field!"
by Bobby Dukes March 17, 2005
 
3.
One who acts like he is superior or better at something than someone else at a certain activity but is really awful at it and no one wants to tell him how pathetic he is.
Guy 1: Dude i put up like 2 points last night!

Guy 2: What a baller!!!!!

Guy 3: Yeah looks like we got ourselves a pro baller over here
by Sgt McMuffin January 27, 2010