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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
no more Mr Nice Guyused to suggest that you will stop being lenient and begin to adopt more severe measures.
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