Y’all already got your belts on the floor so
Batman and Robin are known for their elaborate utility belts.
This is also a continuing joke from the previous line how batman and robin were performing sexual acts, and since they are they already have there belts off
(along with the theme of superheroes being gay throughout the song)
To help improve the meaning of these lyrics, visit “Batty Boyz” by MF Doom Lyrics and leave a comment on the lyrics box