It would appear that 'Rimshine' are simply trying to get there name out there

edit, a link to urban dictionary came up when searching rimshine...
A homosexual black male who trix thugs into getting their butthole licked instead of their twenties cleaned
"gimme a dolla"
"Hell no crackhead"
"Man I'll shine yo rim"
"Ok but make sure you get all of them AHHH mutha f**ka get yo tongue outta my ass"