A schlock is basically a shmuck. Just like a shitty person or piece of trash. I shock them with my rhymes, like how the Pokemon Raichu shocks people

Kevlar is one of the world’s hardest alloys

This is a reference to this episode of South Park:
http://www.southparkstudios.com/full-episodes/s03e17-world-wide-recorder-concert
In it, there’s a frequency, “The Brown Note,” that causes all humans to shit themselves. The competition craps their pants when they hear me rap because it gets them so nervous, so I’m basically spitting the brown note

I’ve got a lab-black pair of Vans sneakers

This relates to a black lab, and my name with the whole dog/hound thing

I’m only 15, so I’m not 18, obviously. But two nines (a type of gun) add up to 18

A nine:

I take Adderall, Synthroid, and Lexapro every morning. Typical teenager is typical. I take so many meds you could hide a giant in dat med bag

I’m a hothead, as in “A person who is impetuous or who easily becomes angry and violent”

People with fevers literally have hot heads

I want this shit in my house

I don’t carry guns, I carry pencils where I would traditionally have guns to slay people with my words