I pulled up on a mothafuckin' unicorn (I'm getting ponies nigga)
from Tyler The Creator (Ft. Jasper Dolphin & Taco) – Bitch Suck Dick Lyrics on Rap Genius
Meaning
One of Tyler’s more playful nicknames (“I’m gettin ponies” imitates Cam'ron’s “I’m gettin money, niggaaa!” from “Get Em Girls”)

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