Quoted from Gryszzz:My mom bought me a sign that said Jason's Mancave for Christmas once and I threw it away right in front of her.
That was not nice. You should thanked her for the sign. Then later got rid of it. Your mother deserves more (maybe, hopefully).
Mancave is a terrible replacement name for Games Room, Rec. Room, Den, Arcade, hell, even Spare room in the Basement sounds better.