If you’re looking for some turn-up tunes to pregame to, then C-Sharp’s ‘Flex On ‘Em’ should do the trick. The Cali-grown rapper is stepping his game up with recent leaks like ‘Welcome 2 the Juice‘ featuring Kevin Parx, Matt Allenn, and Kaliber and ‘Hotbox‘, which set the Internet ablaze, and made the front page of…