To Mario C, you can't front on that

from Beastie Boys – So What'cha Want Lyrics on Rap Genius

Meaning

A friendly jab at Mario Caldato, Jr., the Beasties' producer and engineer, because he was so anal retentive about his production values. From Brian Coleman’s (2007) Check the Technique: Liner Notes for Hip-Hop Junkies, pps. 25-30…

To go along with their laissez-faire attitude toward rhyming on the album, they also downgraded on the microphone side…
MCA: At first we would just plug our mics into a fuzzbox, and Mario hated that.
Mike D: Somehow we knew that we needed just one more banger, and Adam Horovitz had been messing with some part of that song and we started playing over the loop. It was definitely at the very end, like with Eric B & Rakim: My girl was mad at me and your girl is mad at you because it took too long to make this album.
MCA: Your girl was mad at me?
Mario Caldato, Jr.: That song was recorded on some really bullshit mics. We had one and I bought two more because they liked to lay their vocals down all together.
MCA: But [Mario] eventually came around to what we were doing and he even bought us these shitty plastic mics at Radio Shack or somewhere.
Mario Caldato, Jr.: That was the last song, the one that sealed the deal and let us know that album was ready.

Mike’s intro is saying: We’ve got this track locked up, so don’t even try to complain, Mario. Just get ready to hit record…

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