The appearance a person's mouth takes on after having to much collagen injected into their lips.
I walked down Hollywood Blvd and saw more Duck bills than you would in a Chinese restaurant dumpster.
by Alambdadelta March 19, 2017
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The process of shaping ones hand like a duck bill in order to insert into a anal or vaginal cavity. This is often the first step to fisting.
Did you duck bill her first? YEY-UH!!!
by Alex Shrieker January 17, 2011
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When a guy purses both lips out to look like a ducks bill to give a kiss to a woman after she's sucked his cock. This is done to insure that she doesn't try to sneak her tongue in there and get his own cum in his mouth.
Shaniqua came up to give Gerardo a kiss after he blew his wad in her mouth. He didn't want to taste jizz though so he gave her a quick duck-bill kiss and told her to go brush her stanky teeth.
by BabyBaby December 25, 2006
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When one gets a girl off with their chin, giving a girl an orgasm with the use of your chin.

See also, Hairy Platypus
After the date, I took the girl back to my place and gave her a duck-billed platypus, and she liked it.
by platCHypus November 24, 2009
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A person that skips out on their check but ordered the cheapest thing on the menu but also left a tip.
I can't believe that guy ordered the cheapest thing on the menu, left without paying his check and actually tipped me.

You mean then rare Duck Billed Platterporfs?

It just ate like a fuck and then scurried!
by Acme Fugazi June 2, 2019
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when a woman is laying on her side on a bed , with her ass hanging off and grabbing her ankles. The guy come from behind and puts his hands around her head in the praying position(the duck bill) and gives swift abdominal thrusts
after travis got his redwings he proceeded to give amanda a duck billed platipus
by emoney June 20, 2004
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The act of putting on a duck mask and giving someone a blow job while wearing the mask.
"Lisa totally gave me a duck bill blow job last night."
by Blaze<3 October 20, 2011
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