Flunk

[Sarah]

To fail, as on a lesson; to back out, as from an undertaking,through fear.

[Sarah]

To screw up immensely

[Sarah]

When one person vigorously rubs their hands back and forth between someone else's back and backpack.

[Sarah]

a total devastation by one of the following acts:

a really hard hit

a freakishly ironic yet tragic turn of events

past tense: flunked

the result of smoking really good weed

[Sarah]

Something that is even better than getting, Crunk. It is when you are Crunk while flying on an aircraft.

[Sarah]

post-ejaculated cum, deposited in an oriface

[Sarah]

Fail a class, course, or an entire school. Basically, you need to put a lot more effort in.

[Jason Yan]

Fail to reach the required standard in (an examination, test, or course of study)