The act of
blowing off a friend or acquaintance, When someone creates a believable scenario of intentions to meet up and fails to, or purposely declines to show up,
Standing someone up, or
the means of severing a social connection like a friendship.
Person1: gee, hav'nt heard from
dexter in like two weeks... think he's dead?
Person2: Not sure, he always flakes out on you unless you agree to meet up on his terms.
Person1: hey man, wanna go get
schwasted tonight?
Person2: yeah, I was supposed to meet up with that creepy guy later, but i'll just be
flaking out on him, now won't I?