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noun. a person, generally a woman, who rides with you to and/or from work and performs oral sex, to make the long drive go by quicker. A good cummuter rarely talks and usually always swallows.

guy #1:Hey dude how was your early morning drive?
guy#2:It was amazing! i got a cummuter and it made the 45 minutes fly by!
guy#1:I told you man, it makes a huge difference!
by ragingpolarbear October 27, 2011
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