A woman who is already pregnant (with child) allows a man to ejaculate(cum) inside of her while having intercourse (making love)...

It's a dark humor joke to insinuate the growing fetus (baby in the womb) will receive (eat) the semen from the man as food or nutrition because semen has been proven to have nutrients within it or there are no worries of the woman becoming pregnant because she is already pregnant....
Brenda is currently pregnant and she let me to "feed the baby"....
by LouLou3T November 21, 2019
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When a dude gets blown off by someone else’s pregnant girlfriend or wife....and she swallows
I had to stop by Sarah’s on the way home to “feed the baby
by Dirty Randy 69 November 6, 2018
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A drinking technique that entails one chasing whiskey with milk.
"Don't mind him, he's just been feeding the baby all night long."
by the ginger lion July 26, 2007
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A vomit burp. Or basically like mother birds that regurgitate food for their young...
"you look sick, are you going to feed the baby birds?"

*burp
"ew I just fed the baby birds, tasted like Wendy's"

"did you smell that?!?! I think Ryan is feeding the baby birds"
by Twinkdestroyer August 22, 2013
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When a dude gets blown off by someone else’s pregnant girlfriend or ideally wife, and she swallows.
I had to stop by sarah’s on the way home from the bar to “feed the baby.”
by Dirty Randy 69 November 6, 2018
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When you're having sex with two girls and you pull your cock out of one of the girl's pussies and shoot jet after jet of hot, nourishing cum in the other girl's mouth and proudly exclaim, "you're welcome".
She could barely wait until I fed the baby bird. They both begged me for my cum. I had to get busy feeding the baby bird.
by ol' saddleface August 20, 2018
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