A single girl that is friends with a boy who's in a relationship. When the boy's girlfriend is busy this is who he talks to. In extreme cases he might call this girl mommy and even block her when he's hanging out with his girlfriend. If he blocks her he will immediately unblock her when he is no longer with his actual girlfriend.
Boy (drunk calls replacement girlfriend): "My girlfriend is asleep so I called you."
Replacement Girlfriend: "Oh, so I'm your replacement girlfriend?"
Boy: “Yeah!”
Replacement Girlfriend: "Oh, so I'm your replacement girlfriend?"
Boy: “Yeah!”
by Pudgy Monkey December 9, 2023

by Peachfish220 February 7, 2017

a boy and a girl who are not seeing or getting with anyone other than the boy or girl; commonly break up
by dhfnfbsbdn March 1, 2023

girlfriend
by winner:) June 3, 2023

Hailey’s girlfriends name is hope they are perfect together sure they most likely fight once in a wile but the are perfect together
by mia rei November 25, 2021

by fc2078 January 20, 2021

The day of which we all become devoted to out girlfriends (not that we already do that). But theres always a day for that :).
by theonethatstayed August 1, 2022
