Rebound Side-Friend Dick (RSFD)

When a girl goes after the male friend of a guy who just rejected her

Jim and Jane broke up
Jim's best friend Kyle is now Jane's Rebound Side-Friend Dick (RSFD)

Jane wants Kyle's dick
Kyle and Jane hook up

by KingSwagger February 14, 2012

Side best friend

The person you call you best friend when your real best friend is no where to be found

Tyler is Alexis's side best friend when she can't find Maura

by Mojo9599 November 13, 2015

Side-Door Friend

A close friend who feels comfortable coming into your house via the side door, probably off the kitchen. You, too, are comfortable with this friend entering your house through the side door. A side-door friend is probably one of your best friends. Conversely, front-door friends are those acquaintances you are not all that close/comfortable with.

Marcia and me hang out constantly. She is totes a side-door friend.

by TeacheRama August 20, 2007

Side Friend

A friend of someone that has other, closer friends that they would rather be with.

"*Sigh* I'm such a side friend..."
"What's a side friend?"
"Someone who you're friends with, but still have closer friends"
"Oh, like Jeremy!"

by SpookyScarySakura October 8, 2020

Side friends

People you hang out with on a daily basis who aren't really your friends.

All my side friends want a piece of my new pay check ha!

by Allie2002 April 9, 2020