no more Mr. Nice Guy

no more Mr. Nice Guy

An expression indicating that one is no longer going to behave in a pleasant, tolerant, or carefree manner. OK, no more Mr. Nice Guy. The next person to speak out of turn gets detention.
See also: guy, more, nice, no
Farlex Dictionary of Idioms.

no more Mr Nice Guy

used to suggest that you will stop being lenient and begin to adopt more severe measures.
See also: guy, more, Mr, nice, no
Farlex Partner Idioms Dictionary

no more Mr. Nice Guy

Instead of being agreeable and amiable, I (or he, or she, or they) will be tough and uncompromising. This colloquialism dates from the mid-1900s, and is a modern, far more benign substitute for grant no quarter. It appears in numerous contexts and sometimes does not even involve a person, as in “The weatherman has stopped playing Mr. Nice Guy,” which simply means he is announcing a change to bad weather. Lawrence Block used it with more dramatic meaning in All the Flowers Are Dying (2005): “‘Get three [guns],’ she said. ‘One for each of us. No more Mr. Nice Guy.’”
See also: guy, more, nice, no
The Dictionary of Clichés by Christine Ammer
See also:
  • no more Mr Nice Guy
  • Mr Nice Guy
  • Mr. Nice Guy
  • a live one
  • have a spring in (one's) step
  • a spring in (one's) step
  • waltz in
  • waltz in(to some place)
  • waltz into
  • waltz through
References in periodicals archive
'There'd be no more Mr. Nice Guy. If I have to hold practice with eight or nine guys so be it, everyone else who doesn't want to be there can stay the hell home because that's the message that will be sent.
Gavina blows his top after yet another Kia loss: 'I'm tired of this'
Melody has experienced success with several of her Strivers Row titles including Essence best-sellers Sittin' in the Front Pew (Parry "Ebony Satin" Brown), Hand-Me-Down-Heartache (Tajuana "TJ" Butler), No More Mr. Nice Guy (C.
Ballantine Books. (People On The Move)
Boone has released an album of metal covers called No More Mr. Nice Guy. And he showed up at the American Music Awards wearing a leather vest over a bare chest festooned with tattoos.
Pity poor Bill