Creepa -- MTV Reality Star Arrested for Counterfeit Cash Scheme at Walmart

Creepa -- the winner of the MTV reality show "From G's to Gents" -- was arrested last week for allegedly masterminding and executing a counterfeit cash scheme in Florida ... TMZ has learned.

According to law enforcement, Creepa -- real name Thaddeus Chaylon Martin -- provided counterfeit U.S. bills to a female associate and had her buy a $145 cell phone at a SuperWalmart in Gainsville.

Once the woman bought the phone, Creepa allegedly took it to a different Wallmart and returned the phone for legitimate bills.

It's unclear how authorities uncovered the alleged scheme, but when investigators spoke with the woman who purchased the phone ... she told cops she had no idea the money was bogus.

According to the report, the woman "became extremely irate with [Creepa] to the point of having to be restrained by [police] to keep her from physically attacking [Creepa]."

Creepa was charged with multiple counts of fraud and was hauled to Alachua County Jail -- where he was booked and posed for an angry mug shot. He has since been released after posting $10k bond ... with REAL money.

Pretty shocking allegations for a man who won $100k in 2008 ... by proving to Fonzworth Bentley that he was ready to become a "True Gentleman."

We tried to reach out to Creepa -- so far, no luck.