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
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.