Odell Beckham Jr. -- LeBron Tweeted About Me ... Best Moment of My Life!!

New York Giants wide receiver Odell Beckham Jr. says he's been BOMBARDED with praise since that one-handed miracle grab ... but the best moment involved a tweet from LeBron James.

OBJ was at Steiner Sports in NYC last night when revealed that LeBron is his all-time favorite athlete ... and when King James tweeted about the catch on Sunday, it blew his mind.

FYI -- here's the tweet LeBron posted after Beckham's catch: "Man I just witnessed the greatest catch ever possibly by Odell Beckham Jr! WOW!!!!"

Imagine your hero writing that about you. Pretty cool, right?!

Still, Odell is modest about the 3-fingered catch, saying the greatest snag ever made still belongs to ANOTHER NY Giants wide receiver.