Everything that needs to be explained can be found in the first 20 seconds.

Quality image editing by yours truly.
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LYRICS:

Got a few tricks, Gryf with a new hit
Pony Swag, overused, I'll abuse it
Flowin' through kicks, hits throwin' bruises
Sick, I'm addicted to spit pony music
So bronies, y'all don't even know me
I'm a no-show, Rarity, little pony
Twilight's party, ponies make me hard-ly
Scarred in the heart, they're a kick-start, car keys
Starting soon, hit the couch like a monsoon
Nosferatu, flippin' off the lights, mood set
Room checked, family to the moon
No rest when the next episode's new
Got my waifu plush, now it's time
But in between eps, no rush, gotta rhyme
Bronies give me flow, these new friends of mine
Gonna give me inspiration, Pony Swag Prime.