Someone who has a small truck, and emits so-called small truck energy.
"Hey there you little piss baby, you think you're so fucking cool? You think you're so fucking tough, huh? You talk a lot of big game for someone with such a small truck"
By pissergamer007
Some too lazy to leave the room to pee so they pee in a bottle
My friend found out I peed in water bottles and called me piss baby for awhile
By BowserJr124
Someone being annoying, ignorant, or stupid. Usually the person is named Hayden Bartholomew Kirkland
Someone: Stop being a piss baby. Them: Shut up I’m not a piss baby
By Lil_cum_shot
The bloating that occurs on a woman's abdomen when she has a full bladder. Often times after sex a woman will have to pee really bad from the stimulation, which can create a piss baby. It's called a piss baby because it makes her abdomen swell, and loosely resembles a pregnant woman's stomach.
Example 1: I shouldn't have drank all that water. Now I've got a piss baby Example 2: after getting plowed for 30 minutes straight, Veronica realized getting stuffed with d gave her a piss baby.
By Suckmytoes_77
A piss baby is when a woman's stomach becomes bloated from her bladder being full. This usually happens after sexual activity, which triggers the bloating. Called a piss baby because it creates a "piss baby bump." This one makes more sense than everyone else's definition of a piss baby being "a little bitch." Y'all ain't original :I
Rebecca's lover gave her a piss baby after a wonderful love making session. She then sat on the toilet for 5 minutes, peeing until it was gone.
By Suckmytoes_77