To my recollection, he was dubbed “Rick the Bass Player” on the Howard Stern Show during one of several raucous Joe Walsh appearances.*
Among the top sidemen on the LA scene until his passing in 2014, Rick Rosas was an exemplary pocket / song player whose list of credits include several laudable slabs and tours with Neil Young (including CSN&Y, as a sub for Billy Talbot in Crazy Horse, and for a Buffalo Springfield reunion), Joe Walsh, Johnny Rivers, Terry Reid, Etta James, Ron Wood, and Johnny Rivers to cite a select few.
Rick appeared as “Buster” the bass player in Jonathan Demme’s final film Ricki and the Flash (2015).
*According to bassist Bill Cherensky Prior to Howard Stern, Joe Walsh had a show on FM radio (WPLJ, I think). He was Rick The Bass Player on there. The funniest thing I ever heard was his brilliant skewering of McCartney’s Silly Love Song. I mean, it takes talent to use bass playing as satire!