One inhibited by this "Madditude" commonly utilizes the "fav eva" term, may (at times) be seen as a "hater", applies complete and total sarcasm to their actions and words, probably comes off as cliquey, and pretends to be everyone's "bff" when really he/she is definitely not.
Taylor: Oh god, did he ask what we're doing tonight?
Taylor: Well what'd you say?
Maddi: Obviously that we're NOT going out, now we have to make sure we don't see them tonight, shit.
Taylor: He's gonna be so pissed.
Maddi: ha it's whatever, he'll get over it...
Taylor: Wow, now that's some serious "Madditude".