To flake out on plans with your best friend.
My boy and I was gonna hang out Friday but that fucktard crumped out on me.
by Zombieeaters December 03, 2012
To space out. Unresponsive to questions. Starring into space while someone is talking to you.
Man, that dude was crumped out, all he said was 'huh'
by topgas March 17, 2010