An idiom is a term or phrase whose meaning cannot be deduced from the literal definitions and the arrangement of its parts, but refers instead to a figurative meaning that is known only through common use.

probably just a spur of the moment made up (slang) expression.

see example below!

"Lip-smackin', thirst-quenchin', ace-tastin', motivatin', good-buzzin', cool- talkin', high-walkin', fast-livin', ever-givin', cool-fizzin'... Pepsi! [in this case]