The “One Duck” mode is the easiest level on the NES game “Duck Hunt”

Reference to the meteoric rise of artist signed by the Pittsburgh label Rostrum Records such as Mac Miller and Wiz Khalifa

Reference to
“Slam Harder” by Onyx.

H is getting twisted. Pun on the song
“Shifftee” by Onyx, referenced on the next line.

HRex is 19 but he raps like he’s been doing it for years.

Rex is rollin up some joints. Video game character Sonic the Hedgehog is famous rolling up into a ball for speed.

A blue chip is a high-quality, relatively low-risk investment; the term usually refers to stocks of large, well-established companies that have performed well over a long period. Rex invests time in what he does because he believes it will pay off.

Sealing up the car with marijuana smoke in order to get higher by continually breathing it in.

A reference to being with more than one girl at the same time. Synchronized diving is an Olympic sport that features two divers performing the same dives from different boards on the same height level, at the same time.