Killer Mike Celebrates 4/20, His Wife and New Show About Weed Culture

Killer Mike's having one hell of a 47th birthday -- celebrating another spin around the sun, and the fact he's getting paid to spotlight something he loves ... the growth of cannabis culture in America.

Mike joined us Wednesday on "TMZ Live" to talk about his 4-part Vice TV docuseries, "Tumbleweeds With Killer Mike" -- but before we got into that he told us how he's toasting his birthday. You gotta see the clip, but let's just say it involves lots of marijuana and his wife Shay Bigga. It's hilarious.

As for Mike's new show ... 'Tumbleweeds' shows the rapper and activist traveling around the country, showing mary jane's economic impact in cities where it's been legalized.

He says one of his goals is to normalize the cannabis industry by showing the business opportunities it brings, and its positive effects on marginalized communities ... where people have been disproportionately imprisoned for marijuana.

The series debuts tonight on Vice, and you can tell Mike's excited about its potential to shift America's views on legalization.

BTW ... his group, Run The Jewels, will be back at Coachella for the 2nd weekend, and it sounds like he and LP are getting a lineup upgrade.