I slipped myself some pink Xannies

from Tyler The Creator – Yonkers Lyrics on Rap Genius

Meaning

Xanax is an anti-anxiety prescription medication often misused for recreational purposes.

Tyler doesn’t smoke weed; his drugs of choice are Xanax, Ritalin and Salbutamol/Albuterol (for asthma)

The paradox is when he uses the word “slipped”: you can’t slip yourself a drug.
It is quite possible that one of his alternate personalities (probably Dr. TC) “slipped” him the drugs, though…

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