“Throwback” is referring to the style of retro sports jersey that was popular during the early 2000’s. Mitchell & Ness made was the most popular company offering these “Throwback” jerseys. Killer actually refers the company later own in his verse. These retro jerseys were heavily bootlegged, the authentic jerseys started @ $500 so they exclusive to “Ballers”. If you were really popping tags during this era you popped a few Mitchell & Ness jerseys.

A whiffle is slight movement of air in a specified direction. His throwbacks change like the wind or the direction of a “Wiffle Ball” when thrown.
