Top definition
Too-Faced Shadow Insurance. A cosmetic. Eyeshadow primer, prevents creasing and promotes longer wear of eyeshadow. Heroin of womankind.
Girl: I love my TFSI

Guy: Huh?

Girl: Hey don't my eyelids look awesome?

Guy: Uh yeah.........GAAAAAAAHH!

Girl: Ah man u got it all in my hair, and all over my TFSI!!

Guy: zzzzz
by babymama00 May 31, 2009
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