The sexual act of a male inserting his penis into the anal cavity of another individual and when penis has fully penetrated the recieving anal cavity, the male begins to urinate and continues until relieved.
After an entertaining movie and pleasant dinner, Jim asks Kendra if she is interested in coming back to his apartment. Kendra hesitates at first but then Jim quietly whispers, "I'll give you the meanest, hottest, and longest Water Balloon you've ever had." Kendra quickly agreed.
by Ken Mayhew October 21, 2006

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Top Definition
A secret codeword for condoms, used in times when the word condom is not suitable for use. Such as in the company.
John: Hey, you got the 'waterballoons'.
Matt: Oh yeah!
by Digital Native November 22, 2009

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overly jigily breasts
Those water balloons are going crazy
by milk man November 09, 2003

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You're fucking a girl with a condom, when you blow your wad in it take it off and smack her with it. Thus pissing her off but giving yourself a very good laugh.
Oh my god i got brittany with a water balloon last night.
by Josh Quail November 21, 2007

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While having a hot docking session, you have the other guy pee inside your penis and then undock, you then quickly pinch your foreskin in order to make your penis look like a waterballoon.
While Marcel and I were docked, Marcel had to pee, and he wanted to undock, so i said hey foob just waterballoon me.
by spiderlurk3r August 04, 2009

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When someone urinates in your butt during sex.
I'm going to water balloon that chick later. A nice warm stream right in her butt.
by Missyknowsall September 15, 2009

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when an uncircumsized male pulls the foreskin of his dick over his knob and starts to pee. the foreskin then inflates to a decent size (about a handful)thus resembling a waterballoon. although rare, this is single handedly the most disgusting and humerous thing ever created
"gebraldo decided to scare his girlfriend into thinking he had a terminal tumor located on the knob of his cock. So he whipped it out and waterballooned that shit"
by 2 Fresh June 15, 2008

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