Top Definition
(v): to stroke one's shaft until semen is ejaculated from the penis. While riding an effing bike. Seriously.

Happens sometimes at Colorado College...

Possibly the most perverted act one could ever commit.
"Did you see that sick pedophile masturbiking while he passed by all of those eight year old children? He just loves to masturbike; it's his favorite pastime."
by bassist9999999 September 03, 2009
5 Words related to masturbike

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