A male that masturbates using a fake silicon pussy.
Jennifer: Norm's cute.

Camille: Don't you know he's a rubber ducky? Terry caught him last week with his shaft to the hilt inside a super head honcho fake pussy.
by Camille Tightbody November 3, 2011
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The act of shit rubbing up against a girls face in a hot tub and her mistaking it for a rubber ducky floating around.
While having sex with a girl in a hot tub, doggy-style, you slowly let out an incredibly long shit. The current from the hot tub carries the "Rubber Ducky" over to her and starts poking her in the face.
by Drusalt November 19, 2008
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a floating used condom in a bath (either post coital or post jack-off)
i'm not bathing with you untill the rubber ducky is removed from the tub!!!
by DS January 29, 2004
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When a male takes a hold of his testicles and penis and pulls them out together, making the figure of a rubber ducky.
Yo, is that a rubber ducky on your crotch, man?
by okonkwo91 January 24, 2010
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sex acts in a small floating contraption

can be a boat or pool raft

sex on the water
got head on the river the other day...

So you got a rubber ducky

is that what it's called?
by SoapySardines aka Dorian October 6, 2018
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something that Ernie from Sesame Street likes to shove up his ass in the bathtub
Bert! I can't take a shit because my rubber ducky is stuck in my ass!
by bojzzle June 25, 2004
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