The act of masturbating while biking by rhythmically rubbing your crotch against your bike seat. Virtually unnoticeable while in motion, this seems to be a mainly female practice.
Hey Jane, how was your commute this morning?
Great! I was masturbiking all the way up 1st Ave!
by masturbiker January 31, 2014
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masturbike
(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
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