It means being stuck in your ways. Even passed the legal age where you're allowed to Smoke, Drink, Drive and call 1-800-Sex-Lines.
Boy (at age 25): Yo, you want to come over and play Nintendo with me.
Girl (at age 17): Sure, .... hold up, (perplexed) how old are you again?
Boy (at age 25): 25 going on 26?
Girl (at age 17): God Damn you got a Arrested Development. Why should I go out with a grown man when he hasn't grown out of Nintendo? You crazy as hell yo. I'm leaving.
Boy (at age 25): But I'm playing with my brother.
Girl (at age 17): At your Mama's house that you HAVEN'T MOVED OUT OF YET?
Boy (at age 25): But don't you like playing with him too.
Girl (at age 17): Yeah but ...
Boy (at age 25): (Interrupts her) Alright, then.
Girl (at age 17): It ain't gonna be alright when your brother says "Why you still playing Games at this age". I'm breaking up with you Vaahsiyance. (Hangs up)
Boy (at age 25): Jueehsa, wait. FUCK!! (Throws the phone)
Girl (at age 17): That nigga is a dork yo. He still plays Nintendo? I'm surprised I didn't see him walking down the street with a Power Ranger toy in his hand. (Laughing Her Butt Off)