Like buttdialing, but when using Facebook app on your smartphone and then accidentally updating your status when putting your phone away. Especially on phones which automatically predict text when selecting only letter or two. Sometimes my phone is so smart, I think I've also buttbought items on Amazon.
I just checked my Facebook and I totally must have butt-facebooked earlier, because my status is just some random word. Buttbooked?
Someone who pretty much idolizes another person, obnoxiously following/complimenting/laughing at their jokes which aren't even funny. Usually leaves this person disliked by others for being so damn weird.