What does FLEX mean?
Show off
Other definitions of FLEX:
- when you have cash or love to show off, especially show off that you have cash.
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How to use the term FLEX:
dude, that mega louis vitton bag is totally flex!
More slang terms:

;P
Winking and sticking tongue out

CHEEZBURGER
cheeseburger

YAVW
You Are Very Welcome

YATTD
Yet Another Thing To Do