The Fat Sandbag is a Non-Playable character in All Star Smashers. You encounter him on day 2 of Classic Safari Mode. You then face him in a boxing ring, where he is supposed to be beaten up. If you succeed in KO'ing him, you'll be awarded with Trophies.
KO Sound #1: Nonono!
KO Sound #2:
Star KO Sound: Nonononononononononono!
Screen KO Sound: