a small orkish relative, approximately 2-3 feet high, they speak in silly squeaky voices. usually kicked, beaten and trodden on by larger orks. And then eaten.
noun. Trash, garbage, or filth. British slang. Famously, in the 1970s BBC comedy "The Fall and Rise of Reginald Perrin," Reggie opened a doomed (he hoped) shop that sold old bits of trash and scrap recycled into completely useless items. He called it "The Grot Shop." (To Reg's horror, the shop was wildly successful, leading to a string of Grot Shops and, eventually, Grot Industries.)
Something that is "grotty" has a look of filth about it.
Used to describe someone/something that is simultaneously horrible and fascinating. More specifically, used to describe someone that is simultaneously "grotesque" and "hot."