"Stunt" is a colloquialism for show off, so with this line Soulja Boy is saying that the money he's earned has afforded his entire his entire group of friends (his "clique") the ability to flaunt their wealth.
A reference to the card game known as "Spades" -- where the spade suit is the deck's most powerful -- this line is suggesting that MCs lacking any power moves (metaphorically, "spades") should just give up.
This statement has a dual meaning. First that Eminem is feeling a buzz from this hit song. And second, that he had to be taken by ambulance because buzz is phonetically close to bus, which can also mean an ambulance.
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).