when a guy places a strap-on apparatus just above his cock for double penetration of the opposite sex bitches.
"Hey why is your girlfriend smiling so big for?" "Oh I just gave her The Optimus Prime last night."
by dpmjww August 12, 2006
1 more definition
While performing "Whoopie" with your partner, just before you are about to erupt, pull your penis out, blow all over the front grill of a semi, and run the bitch over with the semi.
The cops were impressed with my creative imagination when I conceived THE Optimus Prime, but not impressed with the clean-up and paperwork after the deed was done.
by Jack Macaque July 19, 2010