What does IL2SUS mean?
I Like To See You Speechless
Other definitions of IL2SUS:
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How to use the term
IL2SUS:
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More slang terms:

Freeze Peach
A slang term mocking the act of evoking the first amendment of the U.S. Constitution to protect something dumb. Freedom of Speech should not be used to justify racist, sexist, or other intolerable behavior.

Wallflower
A slang term for an introverted or antisocial person at a party who clings to the walls to avoid attention. The name originates from flower of the same name that grows within cracks on walls.

NICUAR
Now I Could Use A Raise

DBG
Don't be gay