to have sex with and leave your partner immediately after you're done
BOY: ( Zips up pants ) " Aight, I'm finna bounce I'll get at you later "

GIRL: " That's It? You Jus Gon Smash Off On Me "
by mzhyphy20 September 6, 2007
Get the smash off mug.
For an action star to masturbate using two sledgehammers during a scene in a movie set in ancient Egypt.
Abram: "Damn, did you see the new directors cut of the Scorpion King?"

Layton: "What?"

Abram: "The deleted scenes, dude!"

Layton: "Oh yeah?"

Abram: "Yeah dude, Dwayne 'The Rock' Johnson totally did a smash off all over Michael Clarke Duncan!"
by WuShock April 20, 2010
Get the smash off mug.
To knock someone off the road with your car.
I was smashing off on my way to school the other day and the cop pulled me over.

My mom caught my dad smashing me off, so she got her boyfriend to beat him up.
by Chiefpiss September 12, 2009
Get the Smashing off mug.