Top definition
A boy who dresses and sometimes behaves the way girls are expected to, often into more feminine things like "softer" sports, sending thank-you cards, decorating, or home appliances. Stereotypically wears skinny jeans, man buns, and soft scarves. Often brought up with a lot of sisters or a child of a single mother. The opposite of a tomboy.
Fuck you. I'm a momboy.
by DC_Wade October 09, 2016
Happy St. Patties Day!
1. A female who can take care of you when you're out partying, but can still hang like one of the fellas.

2. A female who takes you as her child, but she is also your friend.
The afterparty MomBoy held was lit, and she gave us a place to crash afterwords!
by TheDaveBoy January 12, 2018
Happy St. Patties Day!