The term involves hitting a person/persons named
josh with an avacado. The avacado then explodes turning
said avacado into
guacamole. Thus producing a guacadossy.
Hey look at that guy named
josh over there, lets smack him with an avocado. Call that a guacadossy.
Hey guy named
josh you like avacados cuh?
Guy named
josh: yea cuh
You a guacadossy cuh.