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Phrase(s): pop off
1. Sl. to make an unnecessary remark; to interrupt with a remark; to sound off. • Please don’t pop off all the time. • Bob keeps popping off when he should be listening. 2. Sl. to lose one’s temper. • Now, don’t pop off. Keep your cool. • I don’t know why she popped off at me. All I did was say hello. 3. Sl. to die. • My uncle popped off last week. • I hope I’m asleep when I pop off. 4. Sl. to leave; to depart in haste. • Bye, I must pop off. • Got to pop off. I’m late., Phrase(s): pop someone off
Inf. to kill someone. • Max was told to pop Lefty off because he was trying to muscle in on the gang’s turf. • Max intended to pop off Lefty.
McGrawhill's American Idioms And Phrasal Verbs
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1. Leave abruptly or hurriedly, as in I'm just going to pop off and mail some letters. 2. Die suddenly, as in No one expected her to pop off like that. [Colloquial; second half of 1700s] 3. Speak thoughtlessly in an angry outburst, as in Don't pop off at me? complain to whoever's responsible. [Slang; c. 1930] 4. pop someone off. Kill someone, as in The sniper popped off at least three men. [Slang; early 1800s] All four usages transfer pop in the sense of "explode" to other kinds of sudden or violent behavior.
American Heritage Idioms