Flop ass 

Basically a synonym for douchebag. Can mean anyone that is either scurvy, a putz, stupid, lame, dorky, or a nerd.

That guy has rubber testicles hanging from his back bumper, what a flop ass!!

So you spent all last night Watching MadTV? You are a flop ass!

Flop ass by Tripton July 24, 2008

Flip flop ass drop 

This is when you are riding public transit and you offer someone your seat, only to stand next to them and fart directly in their face.

The kind young man offered his seat on the bus to an elderly woman. Moments later, the look on her face made it clear that she had fallen victim to the flip flop ass drop.

Flip flop ass drop by Miquelito6233 August 13, 2023

Ass Flop 

The top part of the ass that flops out of fat peoples pants when they get up from previously sitting down.

Dude your friend Zach has some serious ass flop going down.

Ass Flop by KrypticDeath July 14, 2010

flopass

Being a flop. Failing to do a certain task.

"What a flopass.. nigga didnt even reach through last night."

flopass by siudys423 May 22, 2009