It looks like Drake is calling out a bunch of artists, particularly Ludacris. He is saying that many artists are copying his rhyme scheme and flow. Here is what Drake told All Hip Hop….

Well, that flow has been killed by so many rappers. And, I never want to use that flow again in life. (Laughs) I wanted to take if off my album. I hate the fact that that rhyme is still in there. To be honest, that flow, you can trace it back to like Big Sean. That’s the first guy I heard utilize that flow throughout the duration of a verse.

I’ll give him that credit. I think Kanye got it from him. Me and Wayne found a dope way to do it. I don’t want to sound c***ky, but the best way its been used was on “Forever.” Those lines just all individually make so much sense. They’re all punchlines.

Then a bunch of rappers started doing it and using the most terrible references in the world. I don’t want to offend somebody. I hate that rappers picked that flow up. I wish they had left that for people that know how to use it. (They go like) “It’s a parade! MACY’S!”

In case you are wondering how Luda used it…here is a part of his verse…

“Couple girlfriends and they all a lil’ crazy/Comin’ down the street like a parade, Macy’s/I fill her up, balloons!/Test her and guns get drawn like cartoons/Doh, but I ain’t talk ’bout Homer/Chick so bad the whole crew wanna bone her!” (“My Chick Bad”)