Having or making a finger baby is simply the act of fingering as performed by a lesbian to another. Lesbians are women and they do not have penises so they cannot actually make a baby. Rather, they finger each other, thus colloquially sex can be called making a finger baby, or often, making finger babies. See the "finger babies" entry.
"You're hot. I want to have your finger baby."
by Jesus1934923848383484 August 05, 2008
When you have finger to vaginal intercourse you make finger babies, because when you make a real baby you have penis to vaginal intercourse.
How was your date, did you make finger babies?
by antlb April 15, 2007
When you come on your hand, in which there's a cut on your finger thus resulting in a finger baby.
After Jason's fifth ejaculation of the day, he realized he had a good chance of having a finger baby 9 months later.
by BlakeP July 10, 2008