When holding the tip of your uncircumsized wang and peeing into it, therefore letting the piss build up until you let it go on some un-suspecting bastard/ bitch.
I did the water balloon on my roommate, unfortunately his girlfriend had her mouth open
by Eric theMeyer September 21, 2005
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The act of urinating during anal sex. Like filling a balloon with a garden hose.
"I picked up this chick from the bar and I totally water ballooned her by accident!"
by Bottle Blondy May 20, 2013
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When you wrap up and, mid smash, wait to get just soft enough to piss into the condom. Fill it up. Slyly withdrawal, pinching and tying off the "balloon". Run.
Ah shit man, I dont think I'm coming to the party.

Why not?

I water ballooned Marika last weekend, not sure if she ever got it out after. Either way, she's gonna be pissed.
by party on April 3, 2015
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Trumps everything thrown in Paper, Rock, Scissors, and therefore, life. Seen on the TV show "Friends".
Phoebe: Scissors beats Paper.
Joey: Fire burns paper.
Phoebe: Water balloon.
by RansomedStallion March 10, 2015
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Tugging on nipples making the jiggly breast move as if you were pinching the knot of the water ballon shaking it.
My nipples are sore, please don’t water balloon me tonight.
by WTerbaloon November 28, 2019
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A term to describe cumming into an uninflated balloon, turning it into a semen-balloon and throw it at kids at a birthday party and watch to see the kids' reaction when they realize what's on them
I used a "Water" Balloon for JAMIE'S BIRTHDAY
by Rionox February 23, 2023
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A sexual act involving 3 people, at least 2 of whom are men, in which one person's mouth and anus are simultaneously penetrated by a penis which then fills each cavity with urine.
- Dude, we should totally go water ballooning tonight!
- Honey, thanks for that romantic dinner -- now let's get a third so you can water balloon me!
- Oy, what a night! I got hella water ballooned and am totally wrecked today.
by m.a.t.t.y. August 13, 2008
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