Fat Trap 

A Fat Trap is when you're on a social networking website, and see a good looking profile picture. Upon going to their profile picture, you see other photos of the person, and realize they are incredibly fat, and are actually ugly.

Person 1: Dude, check out this hot chick's profile picture!

Person 2: That is definitely a fat trap dude, look at her other pictures

Person 1: *checks pictures* oh god...thanks man, you saved me.

Fat Trap by theoneandonly06 November 2, 2009

Big, fat, flapping rat trap 

The mouth someone who is saying something very stupid

Ian: I know everything
Tea-Lady: Shut your big, fat, flapping rat trap.

Big, fat, flapping rat trap by Craig Cummings October 7, 2005

Fat Trapper 

Usually someone of the male gender who isolates an overweight female for awkward sexual moments on a club dance floor.

"Oh man look at Joe! He's one hell of a Fat Trapper."

Fat Trapper by Tasty_Muffin May 24, 2009

Fat-trapping 

When someone is in "decent" shape while unofficially seeing someone and once the relationship becomes official they gain a shit ton of weight. The other person is then trapped in this new relationship with the newly fat fatty.

Omg did you see how Mikah fat-trapped Sarah into that relationship. The most brutal fat-trapping I have ever seen. Once they started dating he gained 70lbs!!

Fat-trapping by Mappsofcambridge September 10, 2016