Similar to the notorius
Weeaboo, a Gagaboo is one who is obsessed with the horror that is
Lady Gaga, and are brainwashed by her
bullshit. However, instead of speaking wapanese, they constantly speak in the "future tense" and believe they are better than most regular, sane people. Don't bother argueing with them. They're not wrong, they're born that way.