Fambush - to be ambushed on facebook. For example when an unwanted person cuts in on a wall conversation, commonly with the result that the unwanted person invites themselves to an event.
Friend 1: "Hey! My main man! Let's meet up at the pub tomorrow for some volcanic lash"
Non-Friend: "Oh wowzarooney! I would love to come for a drink with you guys. I haven't heard from you in ages. I wonder why that is. japes. see you tomorrow at 7"
Friend 1 (aside): "Sheeeeeeeeeeit. We just got propz fambushed"
Fabushay (adjective): Meaning a largely intensified meaning of the word fabulous, generally used by gay men to state how amazing someone/something looks or is.
E.g. 1) Ed: Ohh myy god did you see Sam tonight? She looked fabushay!