-An improper form of performing a hand-job
-When a girl, rather than stroking guy's junk properly, thinks it is necessary to pull a guy's penis back and forth like a manual car's gear shifter
Mike: Hey man, how was she?
Dominique: She did it again.
Mike: HA! You got gear shifted!
Mike: Dom, how was it with that girl last night?
Dominique: Dude what the fuck, she gave me the gear shifter.