The past tense of the word "flaw", which is an
adjective used to describe a person who just bailed, or
frequently bails, on commitments. This especially applies to
flaking out on social plans, such as going to clubs, theme parks, the movies, concerts, and going on dates.
If someone was flaw to you, they flossed you.
Michael: Bro, are we goin' out tonight?
Brandon: Nah man, I have a
chemistry test tomorrow... I gotta study.
Michael: Dude,
that's so flaw... you said
you would go. You flossed me.