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The act of one man flicking another man's penis with any object besides his hand (to avoid any homosexual accusations), the flick must be brisk and gentle so said man does not get injured. While in the process Man 1 must shout "Shifting Gears!"
Man 0: Bro, you gotta go shift gears...

Man 1: I got it... *proceeds to 'shift gears' on Man 2*...SHIFTING GEARS!

Man 2: You're dumb.
by Big D_31 September 25, 2009
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2
The sensation associated with peeing after an orgasm. To "shift" the urethra from cum blasting mode to piss mode.
It took Carl a good five minutes standing over the toilet shifting gears after butt ramming Bruce so he could take a piss and wash the poop out of the tip of his dick.
by Anal Czar September 18, 2010
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