better get on my horse
(one had) better get on (one's) horse
Said when one is about to or needs to leave. Well, I had better get on my horse. It was lovely to see you, as always. Better get on my horse before I miss my train! You'd better get on your horse if you want to make it to Pittsburgh by nightfall.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
(I'd) better get on my horse.
Inf. an expression indicating that it is time that one departed. John: It's getting late. Better get on my horse. Rachel: Have a safe trip. See you tomorrow. "I'd better get on my horse. Thesun'll be down in an hour," said Sue, sounding like a cowboy.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.