tell me another

tell me another

A sarcastic comment said when one does not believe or is skeptical of what someone is telling them. The expression treats what was said as a joke, i.e., it was so untrue or unlikely that it was funny. You're actually going to be on time tonight? Oh, sure, tell me another! You were at the library? Tell me another!
See also: another, tell
Farlex Dictionary of Idioms.

tell me another (one)

Inf. What you just told me was a lie, so go ahead and tell me another lie! (Indicates incredulity.) Bill: Did you know that the football coach was once a dancer in a movie? Tom: Go on! Tell me another one! "Tell me another one!" laughed Bill at Tom's latest exaggeration.
See also: another, tell
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

tell me another

used as an expression of disbelief or incredulity. informal
See also: another, tell
Farlex Partner Idioms Dictionary

tell me aˈnother

(spoken) used for saying that you do not believe somebody because they are joking or exaggerating: ‘I caught a fish that weighed 5 kilos.’ ‘Tell me another! I bet it didn’t even weigh one kilo.’
See also: another, tell
Farlex Partner Idioms Dictionary

Tell me another !

verb
See Tell me another one!
See also: tell
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • tell me another one
  • Tell me another one!
  • Tell me another!
  • sucks to be you
  • let's not and say (that) we did
  • You call this (something)?
  • (hardy) har har
  • promises, promises
  • not going to win any beauty contests
  • sarcasm is the lowest form of wit