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3.
v. to ejaculate into a partner's mouth. And subsequentally to have them feed it back to them.
You better mother bird for me ho, before I slap you.
by Edalexben March 11, 2008
 
1.
A female of superior wit and intelligence, she is the leader of other females in her vicinity. She recognizes that she is a bird, as are all females, but uses her lofty intelligence to manipulate and control all females below her.
Drew: I was talking to this girl, and she knows about how women are birds! It was amazing I finally found a female who isn't a bird.
John: Beware Drew, for she is the motherbird. She knows what she is and is more dangerous than the bird with the fanciest plume.
by Nikki1987 March 06, 2010
 
2.
The act of spitting the jizz from a prior blowjob back into the guys mouth.

After giving oral sex and the male has ejaculated into ones mouth, the person has to pretend to sallow but quickly leans in for a kiss and spits the semen into the male's mouth, therefore coining the name Mother Bird.
"Dude, I heard you broke up with Larissa"
"yeah, bro"
"Why?"
"She gave me the fucking mother bird!"

"Dad, why does your breath smell?"
"Your uncle just gave me the mother bird"
"WHAT THE FUCK?!"
by nuudles February 01, 2010
 
4.
To vomit, especially as a result of having sexual intercourse with inanimate objects while eating or smoking marijuana.
"Dude, WTF! You just MOTHERBIRDed on the SOFA!"
by TooTooTheTooCan October 21, 2007