Definitions by Shewhoknowsall.

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

TFIM by Shewhoknowsall. October 12, 2009