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 Pamela
Duck-Billed Platypus
When one gets a girl off with their chin, giving a girl an orgasm with the use of your chin.
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
The sexual act in which a woman puts two pringles in between her lips to make it look like she has a duck bill and the man will ejaculate into the duck bill and she eats the pringles with the seman.