A Korean Tour golf star was so pissed when he heard a fan snap a cell phone pic during his backswing, he flipped the guy off ... and now the golfer just got hit with a 3-YEAR BAN!!!
Kim Bi-o -- an ex-PGA Tour golfer and the current money leader on the Korean Tour -- snapped on a fan on the 16th hole at the DGB Financial Group Volvik Daegu Gyeongbuk Open on Sunday when he heard the phone make a shutter sound effect during his swing.
Everyone knows that's a big no-no -- golfers HATE noise when they're on the tee box.