When two single people spend as much time together as a pair in a relationship but aren't sexually involved with each other. The term applies best to opposite sex pairs or same sex pairs where at least one is homosexual. Especially applies to situations where one party wants the pair to be sexually involved.
As in half of an
open faced sandwich waiting exposed for the other to be on top of it and for their meats and other
juicy bits to be
smooshed together and mixed.
Friendzone
Why don't
Brett and
Meg fuck already? They're always together
Haha, I know. He wants it but she just wants to be friends. They're in an open-face sandwich relationship