This is incomplete, as the song samples many things that I have never heard, and cannot decipher
Using the Soundcloud I was able to find lyrics for most of it, but the intro I cannot decipher due to the volume, speed and distortion
This is what I have so far

[Intro]
So Arby's says they have Randy
Hi, welcome to Chili's
[?]
Oh boy, Lasagna
Can I get a waffle?
Can I please get a waffle?
Wake up bitch, we are going to McDonald's

♫

I wanna say that was some kind of sauce
(Ahh)
Sauce?
(Ahh)
[?]

♫

[?]
Lasagna (sped up)
[?] meal

♫

[?]

[Chorus: Fast Food Rockers, The Fast Food Song]

A Pizza Hut, a Pizza Hut
Kentucky Fried Chicken and a Pizza Hut
A Pizza Hut, a Pizza Hut
Kentucky Fried Chicken and a Pizza Hut
McDonald's, McDonald's
Kentucky Fried Chicken and a Pizza Hut
McDonald's, McDonald's
Kentucky Fried Chicken and a Pizza Hut

[Verse: System of a Down, Chic N' Stew]

What a splendid pie, pizza-pizza pie
Every minute and every second, buy, buy, buy, buy, buy
What a splendid pie, pizza-pizza pie
Every minute and every second, buy, buy, buy, buy, buy
Pepperoni and green peppers, mushrooms, olive, chives
Pepperoni and green peppers, mushrooms, olive, chives
Need therapy, therapy, advertising causes
Need therapy, therapy
Therapy, therapy
Therapy, therapy,(sped up)

[Outro: Ken Ashcorp, Burgz]

Well it was just
Five guys on a night out (Oh!)
Looks like they could box your lights out
Insatiable hunger
Looking for the one they could take home right now
They're all getting salty
Want to be Sonic, but they're just not fast enough
Want to be that Mac Daddy
But this game of thrones is just too tough

You can't be the king if you taste like shit
The other four guys don't mind a bit
And these Randy Bobandies are so demanding
Knock that pat flat but I'm still standing
Wendy's just another silly girl I knew, but those days are all long gone
If you were right the first time, then how could you be wrong?