In a group of girls, the one who feels responsible for her friends. She often will push away guys and or pull away her friends from guys physically. She is usually either fat, ugly, annoying or all of the above. (Can be used as a noun or a verb)
I spent like $100 on drinks from this hot chick in a Vegas club and as we were heading up to my room, I got mother-henned out of nowhere! The nerve of the fat bitch!
Allright, guys, we need one of you to occupy the mother hen for a bit while I lead this chick out the dance floor!