The process of absent-mindedly playing with an erect
penis. Can also be used as a passive adjective to describe a male persona in which emotional gears tend to be in constant flux and inconsistency, usually causing frustration and bitch fits from their
female counterparts. (Mental stick shifting.) Those accused of dick shifting
will most likely have high rebound rates coupled with less than intact morals.
*While a drunk dirty skank is giving John Smith a hand job, she starts starring off into
space...*
John Smith: Uhh, you want me to just finish? If I wanted to
go dick shifting I could have done it myself.
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*As an adjective*
Stacy: Ohhhmaahhhgod, he'
s totally boning her! Didn't you
guys just break up...
Jammie: Yea, dude like an hour ago? He's in dick shift mode...