keep it cool

When you have a run in with the cops and you have illegal substances you keep it cool by acting calm, smart, and in control of yourself. Never run or panic.

Joe: Damn dude we're getting pulled over hide the weed and put the blunt out!!!
Eric: Ight man just keep it cool we might get out of this

keep one's cool

to remain calm and in control

Don't go berserk when someone bothers you, keep your cool.

Keep my cool

maintain a calm and controlled attitude.

"I have to keep my cool and run my own race"