blow (one's) wad
1. To lose or spend all of one's money. My Las Vegas trip was short lived—I blew my wad at the poker table in the first two hours! Here's $20 for the weekend, don't blow your whole wad 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 wad, we'll get there soon. The game is in 30 minutes. I know you're nervous, but stay sharp, don't blow your wad now.