An old hairy man that wears a diaper and goes around saying "Daddy", "Mommy" or anything of that sort.
by Not The Real Guy March 25, 2017

When you dress your infant son in adult-like clothing such as jeans and collared shirts such that they look like a miniature grown man.
by skb1212 July 3, 2014

When you dress your infant son in adult-like clothing such as jeans and collared shirts such that they look like a miniature grown man.
by skb1212 July 4, 2014

by uncookedgarbanzobean9 July 28, 2019

When fecal matter and sperm mix, usually the byproduct of when a man ejaculates into another man's rectum via the anus canal. This is considered a gay sex act in certain circles.
In typical heterosexual relationships, a man's sperm usually fertilizes the women's eggs via vaginal intercourse. When it comes to making a "man butt baby," the egg is replaced with what is colloquially known as a turd.
"Taking a dump" or evacuating one's bowels after engaging in said act is also known as "delivering a man butt baby."
In typical heterosexual relationships, a man's sperm usually fertilizes the women's eggs via vaginal intercourse. When it comes to making a "man butt baby," the egg is replaced with what is colloquially known as a turd.
"Taking a dump" or evacuating one's bowels after engaging in said act is also known as "delivering a man butt baby."
by New Old Jersey May 2, 2015

A fully grown man that by all appearances looks normal. However, once you get to know him, you realize he's a big baby trapped in a man's body.
Mary: "Are you still seeing that guy James?"
Me: "No...after awhile I realized he was a big Baby Man. I handed him a tissue and called it a day."
Me: "No...after awhile I realized he was a big Baby Man. I handed him a tissue and called it a day."
by ptownshoegal October 21, 2012

I forgot to log out of my facebook yesterday, and when i logged in this morning, my status was "I am a giant man baby gay boy."
by orofino high school January 26, 2011
