Floyd Mayweather -- Entourage Member In Altercation with Woman

A male member of Floyd Mayweather's entourage was involved in an altercation with a woman at the Golden State Warriors playoff game last night ... after the woman allegedly struck him with a "Thunder Stick" ... TMZ Sports has learned.

Sources connected to the Golden State Warriors confirm there was a "mini-altercation" that took place between the two involving one of those inflatable noisemakers that fans bang together during a game.

Before the incident, Mayweather had been booed loudly at the stadium when they showed him on the jumbotron ... and we're told at least one person continued to jeer even after Floyd was off the screen.

Multiple witnesses who were at the Oracle Arena tell us the woman was heckling Floyd and his crew -- but things escalated when she used one of her "Thunder Sticks" on a member of The Money Team.

People in Floyd's camp insist the entourage member did NOT react physically to the incident ... and never hit the woman -- but he was VERY upset.

We spoke with a rep for the Oakland Police Department who tells us, "We do have record of an incident that occurred at about 9:45 PM at the Oracle Arena regarding a mutual combat battery which occurred between a man and a woman."

"Neither party wished to press charges against the other, nobody was arrested and no injuries were sustained."