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 06, 2006
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
n. knucklebabies is the outcome a male gets after he roughs up his suspect (masterbates) and dosent release his sperm into a sock or something and it is all over the back of his hand.
I got home late lastnight and my wife was asleep,so i went to the computer and racked out a batch of knucklebabies.
by richard bellamy March 08, 2008
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
Sperm or semen, especially when induced by masturbation.
"Yo Scooter, what's up with your petrified Kleenex?"

"It's nothin' dude, just my knucklebabies from rubbing one out earlier today."
by dandruffy July 21, 2008

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