Hall of Famer Bill Russell is still down to socialize with today's NBA players, but from time to time struggles to keep up with some of today's slang and customary talk through social media. You can't blame the Boston Celtics legend, as its hard for most people to do the same.

Among them is Jaylen Brown's unusual Twitter handle “FCHWPO” which had the former Boston Celtics great scratching his head trying to figure out the cryptic abbreviation.

“What is FCHWPO?” an intrigued Russell tweeted on Wednesday. “Remember I’m old, lol,”

It didn't take long for Brown to acknowledge the Hall of Famer.

“Just some words to remind myself to keep going,” Brown said replying to Russell.

Russell had just agreed with a prior comment by Brown, claiming that NBA stars are the coolest people.

Boston is hoping Jaylen Brown is ready for yet another run at the Eastern Conference Finals, as well as beyond, this season. Obviously, so is legendary Russell who keeps up with his former franchise.

The 7-footer, of course, couldn't let his Celtics bias pass him by, making a nod to his green roots as a player and coach.

IASITF — it all stays in the family. One more for your book, Mr. Russell.