A 'skerrat' is an ever-more-popular term for a person who is generally insufferable to the point of enraging any reasonable person they meet. Diagnostic criteria dictate that the following two items must be true for someone to qualify as a skerrat:
1) You fuckinghate them.
2) You'd smile (or laugh/cheer/wank) if they died.
'Skerrat' derives from a chavvy dialect's mispronunciation of the modern word "scrote", which itself is a derivative of "scrotum", which is again slang for the technical term, "ballsack", or even more properly, "bollocks".
Person one: "You're such a Skerrat."
Person two: "I'm a scrat?"
Person one: "No, 'Skerrat'. You're such a Skerrat."
Person two: "No idea what you're talking about; I must visit Urban Dictionary to find out what you mean."
A friendly person that if you mess with her, she will glock you with a 9mm in the nut sack. When I go to bed I fear her, if you say her name 5 times without the lights she will appear and throw flower petals at you. If you are evil, she will appear and simply glock you once in the nuts. She only does it once because in the long run she knows your poor azz can’t afford to pay the high deductible.
Overall, she is a wonderful person who you can always come to for advice and an incredible singer and is gorgeous.