Manny Pacquiao -- Hey Floyd Mayweather ... SIGN THE CONTRACT ALREADY!

Manny Pacquiao has a message for Floyd Mayweather ... FIGHT ME ALREADY!

The PacMan was out in NYC with his crew this morning when we asked if there was anything he could say to Floyd ... what would it be?

His answer -- "Sign the contract."

Pacquiao and his team have already agreed to terms for a May 2nd fight with Mayweather at the MGM Grand in Vegas ... though Floyd has yet to sign off on his end of the deal.

Mayweather has not issued an official comment on where they stand -- but his lawyers have indicated there are still issues with the deal.

FYI -- if the two do strike a deal ... it's expected to be the highest grossing fight in the history of the sport ... with experts saying it could make more than $150 MILLION in pay-per-view revenue alone.