"Your mum" is a terrible often used by year 7's as an insult or "violation".
Y/N: "Fuck off yoy fat year 7" Year 7: "Your Mum!"
The name, "Finn" usually means valiant and heroic (also very hot).
Some ppl will fall in love with someone just because there name is Finn
Y/N: Hey whats your name, ugly
Finn: My name's Finn
Y/N: Marry Me