that ain't no lie(redirected from that ain't no lie!)
that ain't no lie
A very informal way of emphasizing that something that was just said is the truth. A: "We're gonna get in some serious trouble if we get caught." B: "That ain't no lie—so let's not get caught!" All this legal stuff at work has me really stressed out, and that ain't no lie.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
That ain't no lie.
Rur. What was said is true. (The highly informal word ain't is built into the expression.) Tom: Sure is hot today. Jane: That ain't no lie. I'm plumb exhausted, and that ain't no lie.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.