a sexual act when one urinates into a womens vagina filling her up like a waterballon
last nite i was having sex and an my husband did the waterballon he peed in me
by keys/cheffric November 5, 2010
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That painful sensation when your balls feel like they're going to pop after getting squished on a hard object, simulating the appearance of a water ballon being over zealously squeezed.
"Bob almost waterballoned his nuts getting off his mountain bike, damn bicycle seats"
by Elder Skywalker October 27, 2015
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