Pusha T chopped it up with Mikey Fresh from VIBE to discuss the new song he did with Ludacris that leaked recently to the Internet. Pusha confirmed that he subliminally dissed Lil Wayne and Birdman.  On the track, Pusha spits:

"With your baby mama f*cking every rapper in the business/Niggas saying you was better when the drugs was in your system/Now your crack swag gone ever since u came from prison/Got you tweeting all stupid, is you skatin', is you dissin"

When asked about why he did it and why he doesn't just say their names, he gave a pretty interesting answer.

"It's new and was for Luda's album.  Oh, because it's a Swizz beat. You got to blame Swizz. See, when Wayne got a Swizz beat... with the "Ghoulish" track; he got busy, well, he tried to.  I'm skilled. I'm skilled in being able to say things to shake them up without saying their names...half of the people in the world don't know Big Daddy Kane and Rakim were beefin. People don't know that Biggie was going at Nas.  I play by old school rules. I play by the fundamentals and foundation of what hip-hop was based on, I'm an artist and I'm artistic with mine."

Source: hiphopwired.com