WTF! FLOYD MAYWEATHER IS BEING ACCUSED OF ASSAULT WITH A DEADLY WEAPON!

Floyd Mayweather is being accused of assault with a deadly weapon -- this time the boxer allegedly tried to run a former employee off the road in Las Vegas ... according to law enforcement sources.

Sources confirm Quincey Williams filed a police report on Monday -- claiming Mayweather banged a u-turn in his Bentley and then "tried to run him off the road."

We're told police haven't spoken to Floyd yet about the alleged incident.

The Las Vegas Review Journal reports one of Floyd's pals -- Ocie Harris -- was indicted for the attempted murder of Williams back in 2009.

Floyd is also accused of assaulting his ex-girlfriend ... he'll be back in court in January for that case.