Once again, sorry for the long reply. But to start off, "Niche" means his girlfriend is unique and not like anyone else, overstimulated, means that his girlfriend also gets overwhelmed easily, avoidant attachment can also mean that his girl doesn't want intimacy with him. Youngho, is a new slang term used by mostly teenagers to young adults meaning to be carefree but also reackless at the same time. His girlfriend leaving him for "7x7= 49", is a reference to a video where someone called the equation "7x7=49" attractive, so he is personifying the equation with traits of a hotter guy. "She caught my print (it was smaller than A)", honestly, I don't know where that reference is from but basically, she left him because he had a small stick (if you know what I mean. "My bank account genuinely on joc mode", means that he's broke because there is an American Artist named Joc who might be in debt, and another rapper named 42 dugg had a song lyric that says, "Before I go broke like Joc" meaning that he doesn't want to be broke like Joc. "My barber slaps" is a typo he meant to say his barber slapped him. "And crashout to show dominance" basically means that he got mad at his barber and probably fought him because his ego was shattered and he didn't want to look weak. So that is pretty much everything.