1. A troll who frequents the same chat room/game room with the express intent to annoy the regulars with ilk, foul language and total disgust and rudeness. Usually said assclown will end up getting the perma-mute by everyone.
2. In general, on the societytotem pole, someone who is lower than an asshole or jack ass.
Room reg: Look! Our resident assclown just came in! Everyone initialize your perma-mute button, as he's going to do nothing more than troll and flood the chat with his foul mouth and stupidity.
Oh christ, the assclown is back. Mute now to avoid feeding the troll.
1. One whose stupidity and/or ineptitude exceeds the descriptive potential of both the terms ass and clown in isolation, and in so doing demands to be referred to as the conjugate of the two.
In a "no surprise" decision, Assclown President Trump was bitch slapped by the 9th District Court of Appeals and schooled in basic 5th grade civics over his Executive Order banning travel from 7 mostly Muslim countries.