Thank Me Later Drake
This is called a double entendre. The girl is fine as in good looking, and you also pay a fine when Popo leaves a ticket on your dashboard.
The Rad Rapper
This gentleman is trying to say he is single and wealthy: no wedding band on his ring finger, and he owns a BMW M3, a light-colored Range Rover SUV and a very white Cadillac (white paint, white trims and white interior).