Wiktionary
pop off
vb. 1 (context intransitive informal English) To leave, and return in a short time 2 (context intransitive informal English) To die suddenly. 3 (context transitive informal English) To kill someone. 4 (context intransitive informal English) To speak frankly; usually to someone else's disdain (i.e. '''popping off''' at the mouth). 5 (context intransitive informal English) To release flatulence, in most cases, in short rapid succession. 6 To thrust away, or put off promptly.
WordNet
pop off
v. leave quickly
die; "The old man finally kicked the bucket" [syn: kick the bucket, cash in one's chips, buy the farm, conk, give-up the ghost, drop dead, choke, croak, snuff it]