What is Side-door Friend?
1.
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.
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When a girl wants to grind on a boy but the girl doesn't want to so she dances with another guy to make the boy she originally want..