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. Why is it that so many lottery winners blow their wad and end up penniless?

2. vulgar slang Of a man, to ejaculate semen during an orgasm. I was mortified, but at least my girlfriend was nice about it: "It's not a big deal—plenty of men blow their wad, uh, ahead of schedule."

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. A: "Don't blow your wad and become a stammering fool in the interview, OK?" B: "Gee, thanks for the words of encouragement."