to very slyly sneak away from a situation or people because they/it are boring, stupid, annoying, slappable or also just because you wanna do your own thing. Similar to what Batman does to Commissioner Gordon on the daily
Some guy: "Dude that sounds awesome, cant wait for that stripper foam neon Jersey Shore party! Nathan can you wait for the....where did he just go, wasn't he just here?"
Not Nathan: "You know he loves to batman his way out of here when he wants to play piano. Thing of beauty really"