1) to be seen by a person but have never spoken to them or heard them speak.

2) Occasionally referred to as "the kid u see in the hallway at school"

3) No interaction what so ever but have heard their name said to u by another in hopes that u know him/her
Anthony: "Hey, I saw your brother the other day in school. I saw him in a picture with you and i noticed him."

Jen: "Did you talk to him?"

Anthony: "No, we are in a 'ghost know' relationship"
by Pizzataco1013 March 29, 2011

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