The man custard that shoots from the penis when rubbing one out.
"That chick is so hot, when I get home I'm gonna pop off some knuckle babies. When doing so, she will tell me I am great, and I will believe her."
by tommyboy79 April 6, 2006
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n. Male ejaculate resulting from masturbation
Lindsay Lohan posed naked for Playboy, and I gave birth to a knuckle baby.
by peo May 24, 2008
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When jacking off and you sperm and sperm runs down the knuckles-
When flashjo3 whips out a batch of the knuckle babies
by MADDENGODOF813 April 25, 2011
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thor's knuckle baby daycare is where thor's knuckle babys go when thor is playing MTG.
Thor - Do you want to play some high level games of Magic ?

RJ - What about thor's knuckle baby daycare

Thor - Fuck you RJ

RJ - Have you seen my dick ?

Thor's knuckle babys - we are legion
by beavers kids January 5, 2012
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When an adult is so overweight or obese they have dimples where their knuckles should be protruding much like a chubby infant.
Yo mama is so fat she has baby knuckles!
"Helen has really put on the beef" "Yeah, she has developed a really nice set of baby knuckles"
by 4075230420 January 24, 2017
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