a clown who anally rapes you in your dreams or chases you around. many people are afraid of them and the mention of this clown can make them have nightmares. they usually use strange objects such as clocks, blocks, hammers, sand paper, and straws.
Whoa! i had this dream last night and a naked anal clown started chasing me around with a hammer then he got me in the ass!
Fucking clown is one of three things, a literal, fucking clown, or a clown you decided to addthe word fucking infront of, or some bastard that pissed you off because he was being a jackass.