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A fat girl or woman who goes crazy on your Facebook when you're single. She comments everywhere like you're her boyfriend, just to make other guys think you're already taken. It's like she's trying to cock-block you before you even get a date.
'Hey, I saw your status! You're my boyfriend now!', even though we've never talked.
'Why are you single? I'm your girlfriend!', because she's jealous of your life.
'You're not going out with anyone else!', she's trying to block you before you even meet someone else.