A batty/batties is slang for:
1)A womans or mans bum/buttocks/arse
2)Said to a gay person or a person who is disliked
'Fuck me! look at dat batty on dat buffting!'
'Shut up you fuckin batty, go arse rape elton john'
'Kick out my yard you bunch of batties!'
Batteries in Engrish.
Only use correct batties