harder than a weed wacker on a Thursday

Usually when someone is working very hard or when they tell a terrible joke and your being sarcastic that their joke is good

Guy 1- hey bro guess what
Guy 2- what
Guy 1-what is fat and goes bump at night
Guy 2-idk what
Guy 1-Ur mom!
Guy 2- wow that joke slapped harder than a weed wacker on a Thursday