floydFloyd “Money” Mayweather did not share A PENNY of the $32 MILLION he earned Saturday night with the waitress who served him $25,000 worth of booze and chicken wings … TMZ has learned.

Nik Nguyen tells TMZ … she thought she’d hit the jackpot when Floyd walked into Rehab at the Hard Rock Sunday afternoon with around 150 people.   Floyd and crew ordered:

5 bottles of Patrone – $2,375
3 Grey Goose  – $1,425
6 bottles of Ciroc – $2,850
20 bottles of Luc Belaire Rose champagne – $11,500
1  6-liter bottle of Luc Belaire Rose – $6,500
200 chicken wings – $600
1 fruit platter – $55

TOTAL BILL:  $25,305.

Nguyen tells us … she went the extra mile to provide Floyd and company with excellent service.  Not surprisingly … the Hard Rock ended up comping Floyd, and he showed his gratitude by leaving Nguyen … chicken bones, empty bottles and that’s it.

She says it’s especially maddening because some of the people in Floyd’s entourage — including Jamie Foxx — were throwing money at random girls who were twerking on stage.

Nguyen says she’s been struggling with 2 jobs and the recent death of her father … but she didn’t walk walk away empty-handed. She says security guards felt so sorry for her they scooped up a few bucks the twerkers left behind and gave it to her.

We’ve called Floyd’s team … so far, no comment.

– TMZ.com