Sources over at TMZ, say Swizz is accused of being a shady business man. The super producer is being sued by a man who claims he wrote Cassidy’s song “My Drink & My Two Step.”
  Antwann Frost — filed the lawsuit two days ago … claiming Swizz hit him up in 2007 to help put together a hit single for rapper Cassidy’s then incomplete album.
 

The song was released soon after — at which point, Frost claims, Swizz lowballed him with a $5,000 cash offer and 5% ownership of the song … while Swizz and Cassidy got the bulk share. Frost rejected the offer … and now dude’s suing for $1,500,000 — claiming he deserves equal partnership in the song with Swizz and Cass. No word yet from Camp Swizz.