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1.
When railing a broad doggy-style, your thumb is inserted into her anus, as you twist your hand back and forth, like steering a truck. Often used as a test for willingness for anal sex, sometimes resulting in the dolphin
I gave Colleen the truck driver last night to see if she was down for some backdoor, but i got the dolphin.
by Killa Money Hacksaw Juggalo January 16, 2009
 
2.
This is when you're banging your chick doggy style and switch from the snatch to her ass, we call this going from the main box to the brownie
I pulled the truck driver on Michelle last nite and she was pissed.
by Larry Lowbed January 20, 2009