Chimneys have a hole. "Sliding down a chimney" means initiating intercourse with your penis, which is what this obvious bottom wanted Drake to do to his behind. Plus, just yesterday my straight friend used "sliding down chimneys" to describe f*cking women, so "sliding down a chimney" would definitely imply you're a top, not a bottom.
And barely anyone is calling this homophobic. You people are getting mad for no reason.