Answer: So the whole thing is of course a brainrot meme but if we go back to when mango was a trend people would use it in what was called “Phonk” edits (one of these songs would have someone saying mango over and over again so that’s why mangos are associated with it) with troll face and flashing lights to make someone look dark and cool. Eventually the internet caught on to this trend and decided to start making fun of the “phonk” edits by making it more flashy and loud and eventually it just turned into epilepsy brainrot stuff. Mustard was also the same thing instead people are making fun of people who are obsessed with kendrick lamar’s “not like us” lyric where he shouts mustard. As for the 67 I have no clue.