A person who continually leaves unwanted posts on your Facebook wall.
"Hey Stacy, I saw that Jim left another post on your wall this morning."
"Yeah, I know. That's his third this week. He's such a wall gremlin."
"Go Bengals!"
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An amazing bitch who practically lives on a wall.
Almost always found in a country.
Rarely in space
My friend is in fact a wall Gremlin