︎head up
n.— «“Ain’t going to be no head up!” Rodrick Kelly, 18, said a Blood yelled. “Head up” is street lingo for a fist fight or brawl. “Then shots fired—boom, boom—twice.”» —“Attorney says man fired shots in self-defense” by Colleen Jenkins St. Petersburg Times (Fla.) Aug. 15, 2006. (source: Double-Tongued Dictionary)
Further reading
People who hunt treasure with metal detectors have a lingo all their own. Canslaw means the shreds of aluminum cans left after a lawnmower ran over them. And gold dance? That’s the happy jig you do if you find something far more valuable than...
An anadrome is a word that forms a whole new word when you spell it backwards. For example, the word “stressed” spelled backwards is “desserts.” Some people’s first names are anadromes. There’s the girl named Noel...