AKA= (from the title of this song) Also Known As (A.K.A.)
We use this abbreviation when we refer to an alternative title which is not the original one but it is also used. For example, the most famous book in Spanish literature is "The Ingenious Gentleman Don Quixote of La Mancha" (aka Don Quixote).

MEAN= Bad, naughty.

KITTY= /kɪdɪ/ (also /kɪtɪ/) A kitten or a kitty is a baby cat. We can also use this word as a loving way to say "cat" even if adult, and we also say "kitty-kitty-kitty" when we're calling a cat to make him come here. Since the sound /t/ goes between vowels, standard AmE will and colloquial BrE can, pronounce it as a the Spanish R in "toro", that is, a quick rolling /d/. (you can see this happening all through the song).

2 MONTHS BACK= (coll.) Two months ago.

A PAIN IN MY CRACK= (coll.) The original expression, a bit rude, is "a pain in my ass" (here the word "crack" refers to the same thing). If someone or something is a pain in your a--, then they are really a nuisance, they're bothering you a lot.

STALKING= If someone stalks you, they are following you, spying on you, watching you, probably ready to attack when the moment's right, but from a hidden position, so you can't see them.

YOU KNOW WHAT I MEAN= (conversational English) This phrase is often used in conversation when we have explained something and the explanation probably wasn't too clear but we think or hope that our listener understands it because he knows what we're talking about. You know what I mean, right?

EVIL= Very bad.

WRAPPER= The piece of paper used to wrap a present (a present is covered or wrapped with paper all over it).

CRAPPER= (vulgar, slang) Toilet (derived from the vulgar slang word "crap" which means "shit", (if you excuse my French).

CHEWS= To chew is to munch food inside your mouth to smash it before you swallow, or to bite repeatedly something which is outside your mouth.

COUCH= /kaʊtʃ/ Sofa.

WINDOW SILL= The flat part at the bottom of a window where you can put a flower pot, for example.

TEARING THROUGH THE HOUSE= Breaking (tearing) things as he moves around the house.

AMUSED= Entertained.

MEANEST= (most mean) Extremely bad.

SPARTA= A city-state in ancient Greece famous because it had the toughest warriors in antiquity.

WHAT IS WITH ALL THE FIGHT?= (coll.) Why are you fighting?

LITTLE BITTY KITTY= Very little cat.

WANNA= (coll.) Want to.

WHERE'D YOU GO= (coll.) Where did you go?

POUNCE= To jump onto something in order to attack.

WITH EVERYTHING THAT YOU GOT=  With all your strength.

FROM ACROSS THE ROOM= From the other side of the room.

GONNA= (coll.) Going to.

BEFORE I MAKE THINGS WORSE= Before I decide to give you a harder punishment.

GIVE IN= Give up, surrender.

SNEAK UP ON ME= Come to me walking very quietly without making any sound, so I don't know you're approaching.

MY SAFETY GEAR= My clothes and accesories to be safe

SCARED= Afraid.

MESS WITH= Cause trouble to.

PREY= A lion is a predator and a gazelle is a pray, because lions eat gazelles.

I'M GONNA GET YOU= I'm going to catch you.

'IM= (coll.) Him.

CORNERED= If you corner someone or have them cornered, they have no escape because behind them there is a wall.

SNATCH HIM UP= Catch him.

BLINK= A quick movement of closing your eyes to keep them moistured.

WHAT IS WITH THIS CAT?= (coll.) What's wrong with this cat? what's the matter with him?

OUT FOR= If you're out for something, you are ready and willing to do it.

INSIDE OF (AmE) = Inside (BrE)

I GOTTA= I've got to, I have to, I must.

KEEP AN EYE ON HIM= Watch him, be careful with what he does.

OWN= Possess, have.

I KINDA FEEL BAD= I kind of feel bad = I feel a bit bad (kind of = more or less)