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1.
In reference to a particularly enthusiatic session of masturbation
Sorry geoff, can't play cricket at the moment - still recovering from an armbreaker I had this morning.
by Davidoff Eglinksi March 23, 2009
 
2.
a very long masturbation session, where it feels almost like your arm is ready to break.
john: i had a wank last night and it was a propper arm breaker!

jack: fuck me mate you need a bird!
by buzz December 22, 2003
 
3.
a huge line of cocaine done by peer pressure; "twisting someone's arm" until it breaks.
Let's line up some fat arm breakers!
by joe c. blow September 11, 2006