I'm doper than Brittany and Whitney
I'll throw spears at your Houston residency
He is saying that he is doper that Brittany Spears and Whitney Houston, who both were known for using drugs/dope.
The next line builds off the last line by using the last names of Brittany and Whitney saying that He is dope with music and will come attack you and goes for the gold.
Also is a diss to a Texan artist he has beef with.
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