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1.
To take a shot of liquor and pass it around mouth to mouth. Similar to shotgunning weed. Preferably done with cuties.
She and I were totes motherbirding Jameson to Samo, and then A-trak was like, "only if Samo passes it to me."
by ghostofmakeoutpast April 25, 2011
 
2.
When a girl is finished giving oral sex, and the man ejaculates into her mouth, she spits it back into his mouth, much like a mother bird spits up worms into its babies mouth to feed them.
Somewhat like snowballing.
David likes it when I start motherbirding in his mouth. Davey like it.
by youadirtygirl November 29, 2011
 
3.
When you performe the act of fellatio on a male, he then ejaculates into the mouth of the sexual partner. From this point the partner of the pleasure receiver contains the semen in their mouth and spits or kisses the semen in his mouth. Hence mother birding.
"I'm think of mother birding Josh to spice up the relationship" "I mother birded Dan and he totally loved it"
by Sexual goddess December 17, 2013