Disgustingly and longstandingly dirty. Applies to an inanimate object, and implies that it is so grody that it has evolved life. Example: You guys, this towel can't be our bathmat anymore. It's twitching. OR Someone wash these dishes, they're twitching!
TWITCHING
Meaning of TWITCHING in English
Slang English vocab. Английский сленговый словарь. 2012