I'm sorry, I can't explain...it was a joke made by Larry some time ago when he wrote a parody of someone doing a one-man-show where, besides all the other instruments, he was "rotating" a maraca "inserted" in a part of the body which is usually hidden.
(Try to use your imagination...)
_________________________
Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.