Dr. Dre & Snoop Doggy Dogg - Deep Cover (aka 187)
Snoop is absolute sick in this classic shit

all of his verse and how he flows is priceless. Especially after 03.00 min mark and beyond, and best part is:
"We'll give you 20 G's if you snitch on your homey,
We'll put you in a home, and make your life plush,
Oh yeah, but you got to sell dope for us."
Hmmm, let me think about it
Turned my back and grabbed my gat and guess what I told him before I shot it.
"If you don't quit, yeah, if you don't stop, yeah, I'm lettin' my gat pop"
Cause it's 1-8-7 on an undercover cop.