The unfornutate condition in which one arm is larger and more heavily muscled than the other. Men claim that this is the result of playing a lot of tennis, but generally the real culprit is vigorous masturbation.
Mom: "if Timmy doesn't stop playing so much Tennis he'll wind up with Tennis Arm"
Dad: "...and if he doesn't start putting a sock on it we're going to have to throw away his bed sheets!"
Dad: "...and if he doesn't start putting a sock on it we're going to have to throw away his bed sheets!"
by squiggular November 27, 2021

by R F May 31, 2006

when a male has one hugely muscular forearm, (generally their prefered hand) due to masturbating too much
by dirtybird45 September 12, 2009

by Lil bebang June 11, 2014

Oh look what came in the mail, a scale and some arm & hammer - Outkast
I got to make a million ... using no flows, just arm & hammer and four o's - Nelly
I got to make a million ... using no flows, just arm & hammer and four o's - Nelly
by Robin Pocket May 9, 2004

An extraordinarily large penis
by Conan Troutman August 8, 2003

In American football, a would-be pass-receiver's arm extended timidly, less than full length, because he senses a tackler bearing down on him and is not whole-heartedly eager to catch the ball. Usually plural.
by RB Jr. September 10, 2008
