Drop Flop

when you shit your pants and have no time to go to the bathroom, while walking you drop your pants half way and flop the turd out without breaking stride.

Hung Lu was late to school and shit his pants so he did a quick drop flop to make it to class on time.

Flop drop nollie

The most difficult skateboard trick ever. You make a nollie , but you land on your hands and flip to your hands while your board is doing a 360 , you land on your feet again and do a kickflip and you and with an impossible .
It's important that you do it in this order.

He is so good in skating, he's the only I know who can do a flop drop nollie!

Drop a flop

The meaning is the same as "fall".

I did it like drop a flop.