NFL Star Randy Moss -- Barbershop REVENGE!!!

Payback is a bitch ... and expensive ... that's the lesson one scumbag hair salon owner is learning the hard way after burning NFL superstar Randy Moss for $160k back in 2005.

Back when Moss was playing for the Oakland Raiders, the Pro-Bowler agreed to lend a ton of cash to a hair entrepreneur named Kelvin Jones ... who wanted to open a fancy hair salon in Palm Beach, FL.

According to court docs obtained by TMZ, Jones was supposed to pay Moss back in 96 easy monthly payments. Problem is ... Moss never got his cash.

Moss claims he tried to collect ... but Jones was playing cat and mouse with his assets ... so he sued.

But Jones blew off the lawsuit ... so the judge ruled in Randy's favor ... which means he's gotta pay back the entire $160k ... plus another $62k in interest, fees and penalties.