One of Floyd Mayweather's gigantic bodyguards has been accused of roughing up a restaurant patron during a heated altercation over the weekend -- and it all culminated in a citizen's arrest.
TMZ Sports has learned ... Mayweather and his security team hit up Hot N Juicy Crawfish in Vegas on Sunday afternoon.
Sources tell us ... a verbal altercation broke out between Mayweather's team and a male/female couple at a nearby table, who were teasing Floyd that they were Pacquiao fans.
We're told things escalated when the couple whipped out their cell phones and began shooting video of Floyd's crew.