What it means
A punch-the-air little shout for when things go your way. Goal flies in, your mate says yes, you find cash in an old coat, and out it comes before your brain's even sat down. Very British, very spur-of-the-moment, usually loud, grinning, and sometimes stretched into get innnn or get in there.
Usage examples
"Opened my old puffer and there’s a tenner in the pocket. Get in! Straight down the offie, mate, drinks on me tonight."
"Last-minute winner in the cup, get in!"
"Get in, the train is delayed so we will catch it after all."
"Got the refund email and the money's already back in my account. Get in."
"She said she'd sort us guest list for Friday. Get in there."
Where it comes from
A triumphant shout lifted from urging something to get in, like a ball willed into the net or a horse over the line. When it finally lands you yell get in to punch the air and celebrate the win.
