A fork of Rural Dictionary
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
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
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.
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!
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!"