Busta Rhymes White House Visit to Change System Woo Hah! Woo Hah!

3/31/2016 10:32 AM PDT

Busta Rhymes Going to the White House to Change the Criminal Justice System ... Woo Hah! Woo Hah! (VIDEO)

EXCLUSIVE

Busta Rhymes is hot as fish grease over long prison sentences handed down to non-violent criminals ... so he's become an activist, fighting to change "mandatory minimums."

Busta spoke to TMZ inside his NYC music studio and says after a close friend got 20 years for a marijuana charge ... he had to get involved and help change the justice system and the use of elevated punishments.

The hip-hop legend says he teamed up with FAMM (Families Against Mandatory Minimums) ... and even scored a meeting at the White House.

It's a pretty remarkable clip -- about as political as we've seen Busta.