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1. TFIM
Thanks for inviting me.

Such as not being inviting somewhere, even if you know it was a girl's night out of something.

Can be used as a joke.
A: Wanna hang out
B: Naw I'm going out to eat
A: TFIM
2. TFIM
The Fuck Its Monday!
Shawn: TFIM Jeff

Jeff.: I know today is going to suck!
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