on the horn

on the horn

1. Currently using or speaking (to someone) on the telephone. Jerry, get on the horn to the warehouse and tell them we need a few more pallets of paper. After our dreadful meal that night, I was on the horn to the manager the very next morning.2. dated Lustful or sexually excited, especially of a man; having an erection. Sarah became quite embarrassed when she noticed that her date was on the horn in the middle of the movie.See also: horn, on

on the horn

on the telephone. North American informalSee also: horn, on