To orgasm secretly or quietly without notice.
"Todd: dude, where the hell are you. I've been trying to find you for the last 30 minutes."
"Ben: sorry dude. I just had to jizzper in this bush real quick, I'm on my way."
by MnK July 2, 2020
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An undergarment similar to a diaper worn specifically to collect jizz.
There were so many sexy women at the party that I had to wear a jizzper to avoid making a mess in my pants.
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