Not Playing Nice 

When someone or something does something seen as cool, rude, cheeky, dumb or fun.
The phrase originates from the cool song by Verbalicious.

Your Friend: "I think your hair really sucks"
You: "That is not playing nice!"

Not Playing Nice by Chris Overall May 16, 2005

not playing with a full deck

an expression used to indicate that a person isn't very smart

see also - not the brightest bulb on the porch, not the sharpest pencil in the drawer, a few bricks shy of a load,

Little Davey tried to iron his short & curlies (he's not playing with a full deck).

not playing with a full deck by Hey-Johnny-Johnny June 11, 2006

not playing any games 

basically means ur not fucking around

fuckin hell have u drank that whole bottle of vodka?

yeh im not playing any games

not playing any games by Tren September 28, 2004

not playing videogames 

A phrase synonymous with masturbation, with the implication being that, whenever one is not playing videogames, one is masturbating.

1. Last night, I was not playing videogames. 2. I didn't play videogames for 5 minutes.

not playing videogames by Tarok, son of Mohg October 11, 2011

not playing with a regulation ball 

mentally incompetent; mentally challenged

I suspect that panhandler with the blow-up doll is not playing with a regulation ball.

not playing with a regulation ball by Mr. Tabrapit December 4, 2010

not playing your cards right 

the act of one partner(male or female)begging their partner to have sex with them every time that they are together, however the other refuses by claiming that he or she doesnt have a condom when in actuality both have condoms

Despite the fact that Will and Sarah have dated for over six months, much to Sarah's dismay Will refuses to play his cards right.

not playing your cards right by Newfy June 9, 2005

He's not playing with a full deck 

Yet another way to call someone a fucking dumbass.

Person 1: hey man look at that douche-bag with the popped collar who is wearing aviators inside at night.

Person 2: He's not playing with a full deck

He's not playing with a full deck by Con#1 July 19, 2012