The phrase "little shit" is an insult used to describe someone who is disliked or thought of as annoying or troublesome, usually in a playful or informal way. Full definition
How about all cockneys are soft pricks & should fuck off back to their smoke filled, hooker infested little shit box city???? (whoateallthepies.tv)
I've been remiss in not also recognizing the work of Jesse Eisenberg as that son, an unattractive little shit who somehow holds the whole movie together. (slate.com)