that's one on me

Idioms  

1. That's a joke at my expense, as in And after all that discussion they didn't show up—that's one on me. This phrase must be distinguished from that's a new one on me, which means “this is the first time I've heard of or seen that” (as in A checkerboard rug—that's a new one on me). Both idioms can be used with other personal pronouns (for example, that's one on you) and date from the early 1900s.

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Example Sentences

I guess I'll own up that's one on me.

From Project Gutenberg

“Now, that’s one on me, Scotty—” “Oh, it was a bluff, and Fisty didn’t have the nerve to call it.”

From Project Gutenberg

That's one on me, all right, and you're welcome to laugh, but little Hal Harrison has learned his lesson.

From Project Gutenberg

"That's one on me," admitted the lieutenant, sheepishly.

From Project Gutenberg

"That's one on me," chuckled Davidson.

From Project Gutenberg