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1. side car
to sit down in a stall adjacent to an already occupied stall in the bathroom. deemed especially rude when there are other open stalls NOT adjacent to the occupied stall.
dude.. i was taking a dump and some guy side carred me!
2. side car
a person with 1/2 a pair of testicles.
That guy is such a mook I bet hes a sidecar.
by Netch Jul 15, 2004 add a video
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