Pop off

[Tanya Shivari]

telling someone to fight you. in other words, DO SUMTHIN

[Donald Trump]

(v.) To lose ones cool; become really pissed off. The idiom is in reference to a pressure cap popping off, usually resulting in a nasty burn or imminent explosion. Thus, the person who caused the pop off is about to get told or be destroyed, depending on the nature and severity of the inflammatory incident.

[Sarah]

Verb or noun The starting point of an event; ie a fight or a party.

Also, the action of shooting a gun

[Little_Girl]

Aussie slang for farting

[Britney]

A fart or the act of flatulence. Breaking wind.