One person:
Knock Knock
Everyone:
Who's there?
Same person:
{insert first part here}
Everyone:
{repeat first part} who?
Same person:
{insert second part here}

Everyone:
At the gangbang!
Oh yes she does!
'Cause the gangbang gives her such a thrill.
When she was younger and in her prime,
She used to gangbang all the time!

But now she's older and turning grey,
She only gangbangs once a day!

Examples:

1st Part: Iraq
2nd Part: I racked up fi'ddy bitches...

1st Part: Isnot
2nd Part: It's not going to suck itself, bitch...

1st Part: Iran
2nd Part: I ran a shuttle...

1st Part: Yugo
2nd Part: You goin' down on me yet, bitch?

1st Part: Anita
2nd Part: I need a rubber...