What does OSIM mean?

Oh Shoot It's Monday

OSIM

Other definitions of OSIM:

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How to use the term
OSIM:

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More slang terms:

LSHMSFOAIDMT

LSHMSFOAIDMT

Laughing so hard my sombrero fell off and I dropped my taco

ESPN

ESPN

Entertainment and Sports Programming Network

YHF

YHF

you have failed

TWMA

TWMA

Till We Meet Again