What it means
Go off means the energy suddenly jumps to max. It can be praise when someone kills it on stage, in the chat, on the dance floor, wherever. It can also mean someone pops off and starts going off in an argument. Same phrase, two lanes. The context does the steering.
Usage examples
"Did you see Keisha at the awards? She went off, full Bay Area show vibes, crowd screaming, phones up, even security looked panicked."
"The whole crowd went off when the beat dropped, hands up, nobody sitting down."
"He went off in the group chat over a parking spot, fifty messages before lunch."
"When Megan hit that last note, she fully went off and the whole room lost its mind."
"I only said the line was long and he went off like I'd insulted his family."
