Odell Beckham Jr. -- I GOT TO MEET MY HERO ... Takes Pic with LeBron

Remember when NY Giants receiver Odell Beckham Jr. said the coolest moment in his life was when his hero LeBron James tweeted about his legendary 1-handed catch???

Well, last night ... OBJ got a new "coolest moment" in life -- when he met LeBron in person and they took a picture together!

As we previously reported, Beckham Jr. had called James his "favorite athlete" and talked about how much it meant when LeBron gave him props for that sick grab against the Cowboys.

The two finally met in person at dinner Wednesday night -- and you can by the look on Odell's face ... dude was stoked!!

In fact, James even posted about it ... writing, "Giving the game to my young king @iam_objxiii tonight at dinner! Keep going homie and #StriveForGreatness #RWTW."

Pretty cool, right?