Faux latin used in order to describe a situation where the goofiness has reached it's maximal potential within either a conversation, a show or simply by the viewing of memes. Or when you're not really mentally sober.
This word can also be used in reference to others as a type of name.
Example 1:
Michael: "Bro, what the hell was that LMAO?"
Arwen: "That your momma on the mic, bro? Why she sounding like that?"
Alex: "Come on guys, it's not that funny."
Arwen: "Bro, she be sounding like goofius maximus up in there"
Example 2:
William: "Yo, check out this meme I just found"
Henry: "Why are they walking like that?"
William: "I don't know but it's goofy as hell."
Henry: "literally goofius maximus."