when two guys piss in the same urinal or toilet bowl and cross their urine streams.
Joe: Hey chris, you wanna go cross polinate?

Chris: Cross polination? HELL FUCKIN YES!!!
by Kyle Levine October 6, 2006
Get the Cross polination mug.
Using the same finger to pick the second nostril of one's nose immediately after picking the first.
The dude next to me at the traffic light was doing some serious cross polinating this morning.
by Harrrry March 10, 2009
Get the Cross Polinating mug.