Check out the 7'5" Boston Celtics rookie -- a beloved fan-favorite -- taking over the famous Boston Pops Orchestra for their Xmas show ... AND KILLIN' IT!!
The 24-year-old -- born in Senegal -- took the stage at Symphony Hall in a size 48 double extra-long tuxedo ... and temporarily filled in for conductor Keith Lockhart for a rendition of "Sleigh Ride."
HE EVEN BUSTED OUT A SPIN MOVE!!! GIVE THIS GUY A CONTRACT!
Fall absolutely smashed his orchestra debut -- and the crowd went wild for him.
After the show, Fall gave props to Shaquille O'Neal -- who conducted back in 2010 -- telling the Boston Globe he prepared by studying Shaq's performance.