That's okay. I'm new here, but I'm not a new rapper by any standards. Here's something I used at another rapsite:

Rap name's Skam, and I'm a killer MC
What you drop can't test to me.
I'll waste you now and I'll waste you again,
I kill you twice over with a pad and pen.
So don't bullshit that you think you'll win.
Cos I'm a god, and that's a sin.
So when you feel that you can't test,
I'll finish up and lay you to rest.

I kill you now, cos you spit shit.
Then fuck up your wake with a drive-by hit.
I don't take prisoners, crucify my listeners.
Rape your rhymes and skullfuck ministers.
As you can see I'm a fucked up kid.
Rotten as Johnny, Vicious as Sid.
So other other MCs, don't play, it's not a toy.
Your ass got charred by a great-white boy.

((then the other guy posted))

Yo muthafucka it was 16 bars.
You dropping ten means you gonna take scars.
I be riding on through in a tinted Corvette.
Wit' AKs at your wake, And that ain't a threat
Cos I don't make threats, this shit is serious.
I snap out so hard, you motherfuckers go delirious.
MC killing you at 20 paces.
Then blow this shit up in you amateurs faces.

And now you thinking you know me.
Well SKAM's got shitloads of stuff that you don't see.
I'll gun you down for half a buck.
Cos nigga's my way don't give a fuck.
You's a ho, and yes you's a slut,
And there you go giving me shit when you can't cut,
So don't try and rap when u busy suckin dicks.
This victory is mine, I win battle number six...