blow (one's) cool(redirected from blew their cool)
blow (one's) cool
To lose control of one's composure, temper, or nerve in a given situation. He really blew his cool when the waiter dropped his food. I really blew my cool during the interview.
blow one's cool
see under keep one's cool.
blow your coollose your composure; become angry or agitated. informal
blow (one's) coolSlang
To lose one's composure.