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a legendary pimp who wanders the town at night pimpin you hos and leaves his mark by dippin his one and only testicle in a can of blue paint, swangin it up and slapping his victims with it. The paint can never be washed off.
damn the uniballer pimped jaimes mom last night!
uniballer by S-Sizzle April 19, 2006
"brian earp"

talk to him on roadkill0066...hes an interesting guy with one testicle
Brian is the most amazing uniballer i know
uniballer by brian earp February 22, 2004

Uniballa 

When a man with one testicle inserts his testicle into a womans vagina.
Nate: Hold on...Its almost in...
Heather: Uh oh the uniballa strikes again!!
Uniballa by Uniballa June 14, 2010
a man only having one testicle
Stevie K has is a uniball because he only has one testicle
uniball by mogger05 December 22, 2004
to hit someone so hard in the nuts that their testicles fuse together into one. essentially its a really hard sackwhack
if u dont shut up im going to uniball you
uniball by herpderp123 August 24, 2010

Uni-Baller 

Any man who overcompensates for missing a ball (testicle) by being excessively aggressive, critical, masculine or pompous. a.k.a. Juan Bahler.
"Say, Dad, If winning isn't everything, then why does Brian J. Kelly always insist on keeping score?"

"Because he stands a mere 5 feet 8 inches tall and is a bonafide Uni-Baller, that's why. ...'boy's only got one ball."

"Bet crowded elevators probably smell different to midgets too, huh Dad?"
Uni-Baller by Rural_Dictionary November 22, 2011