keep one's cool

to remain calm and in control

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

by Light Joker March 24, 2005

losing one's cool

To lose one's composure. Most people lose their cool when prompted by a negative impetus, like sexual rejection or poor brunch service.

"Losing one's cool is the sexual equivilent of an angry, limp penis."

by Poop.butt. April 11, 2014