Lexicon. Mildly derivative of Bill Cosby’s routine of having a rhino for a pet. This takes it one step further, and refers to how servers sometimes get stuck with specials they know are dubious, but they have to flack to the diners anyway.

“Tonight we have artisanal, free-range rhino snot pie as our special dessert…”

By extension, anything hoisted on service people as something they have to enthuse over:

“Well, they seem all-in for the 7-cylinder hybrid sports wagon.”
”Rhino snot pie. I just loooove this car!”