51-50, I'm off the Heezy,

from Odd Future (Ft. Domo Genesis, Hodgy Beats & Tyler The Creator) – Rella Lyrics on Rap Genius

Meaning

5150 is a California Welfare and Institutions code which allows police, doctors, etc. to confine a person deemed with a mental disorder.
In other words, Tyler the Creator is a crazy person on the loose, and is deemed extremely dangerous.

51/50 is a watch made by Nixon, the skateboarding brand, and notice he points to his watch in the video.

New Era, a baseball cap company, makes hats called 59Fifty and 39Fifty, thus he’s also referring to the hats, being off the “heezy” (head.)

Lasty, this could be a reference to Hurricane Chris' debut album 51/50 Ratchet, as Odd Future has a habit of using the word ratchet lately

https://twitter.com/fucktyler/status/171760029932863488

https://twitter.com/oddfuckingtaco/status/170219832426496002

https://twitter.com/DamierGenesis/status/171128033799970816

5150 is also the type of Guitar amp head that the Trash Talk members of the TrashWang collective use to play music. ‘Off the heezy’ — heezy = head. 5150 = head.

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