Originally, slang for headlice in a hat...
Nitty can now mean pretty much anything you like :)

Nickname for the name "Anita"

A snakey guy who thinks he’s on piss but isn’t, full on nerd, ain’t rated in ends

Means nothing, nutin, nada,etc.

someone who likes to smoke a faggy waggy when they are bored

Someone who is overly obsessive, annoying, jealous, irrelevant, attention seeking, just a general nuisance and waste of life aka a campaign of pro choice.

The word is used in a slang manner to designate a woman who has Dirty/Ugly Titties.