The Maraca is achieved when someone inserts their massive throbbing cock into someone else's anus or vagina and thrashes it around inside them until the other persons ribs shatter. The broken bits of ribs should produce a rattling sound when the person is shaken.
While the male is bent over on all fours he tucks his Penis and Testical''s rearward between the legs so the package is hanging out behind, while the partner grabs the shaft and plays it like a Maraca.