"sick flex" is a reference to two pop culture points of interest. "sick" refers to the mid charting hit "Down with the Sickness" by Disturbed that broke the Billboard top 20 in 2007. "flex" is an homage to the late Billy Mays due to his relentless pontificating on the water-resistant properties of the made-for-tv product Flex-Seal. In essence, you are both down and sticky, a condition we refer to as "Peter Northed".
by Indexfossil May 6, 2021