Rihanna knows EXACTLY how to please a man! Yep, you heard me ... especially if that man is a waiter   because on Friday Night she gave one lucky waiter in Hollywood the biggest tip of his food handling career.

It went down at the Laugh Factory comedy club. Rihanna hanging out with 6 of her friends having some beverages and checking out Dane Cook tell on stage. 

When the bill came, and it was only $80, ... TMZ.com was told, Rihanna asked the waiter what the biggest tip he ever received. He said, "$100", so Rihanna hit him off with $200 and replied, "Now I'm your biggest tip."

If only he said more...