Fell off the truck 

Stolen; Something obtained or being sold illegally.

"Hey dude, Check out this new PS3. Only paid 50 bucks for it because it fell off the truck."
"You lucked out, man."

Fell off the truck by Madame Waffles December 18, 2008

just fell off the turnip truck

Naive. Implies rural unsohistication versus urban savviness.

"A Rolex for $50? Do you think I just fell off the turnip truck?"

just fell off the turnip truck by The Demon Prince November 17, 2006

fell off the turnip truck 

Dumb. Stupid. Implying that you've been isolated from the world (on a turnip farm).

He understands what you're saying. It's not as though he just fell off the turnip truck.

fell off the turnip truck by Shminka May 28, 2016

fell off the back of a truck 

A reply generally given by bentnose boys to the law-abiding consumer to convince them goods are legit. Now often used sarcastically to refer to stolen goods.

Lula Mae: This TV is very affordable. It's not stolen is it?
Vinny the Mafioso: Nah, it fell off the back of a truck

fell off the back of a truck by oz November 7, 2003