Top Definition
When two motorcyclists pass each other on the road and each lowers their hand in a symbol of friendship. They do not actually touch, but it is acknowledging each other's existance on motorcycles.
Tom was driving his Harley down the road when he saw Jim comming the other way on his crotch rocket. Both riders lowered their left hands and gave the low five.
by masterfw July 02, 2009
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