Top Definition
Someone who bothers you incessantly on Facebook, commenting on every status, trying to chat with you every time your online, being a general bug, this causes irritation, anger and can lead you to log off just to stop communicating with them.
Dude Brian is such a facebug!! I can't be online for 5 minutes without him harassing me.
by know your wrights October 13, 2009
1 more definition
The constant bug that effects the website facebook.
1.
Person 1 - "This facebug is stopping me from looking at my online friends."
Person 2 - "Unlucky"

2.
Person 1 - "I can't delete this guy off my friends list!"
Person 2 - "Looks like you have a facebug."
by Demno November 07, 2009

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