blow (one's) load
1. To lose or spend all of one's money. My Las Vegas trip was short-lived—I blew my load at the poker table in the first two hours! Here's $20 for the weekend, don't blow your whole load tonight.
2. Of a man, to ejaculate semen during an orgasm.
3. To lose control of one's composure, temper, patience, or nerve in a given situation. A reference to premature ejaculation, it is usually used in the negative. Don't blow your load, we'll get there soon. The game is in 30 minutes. I know you're nervous, but stay sharp, don't blow your load now.