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.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.