Chum Chum Share definition Flag Chum Chum is extra fat/flab that is on you're forehead. This can also be related to fat layers on the foreskin. " Wow Harris that is a lot of Chum Chum you got there" Chum Chum by Tado October 12, 2009 Words you can keep railfan mug chonk mug chud mug based mug 67 mug slime mug mogging mug chopped mug thot mug glazing mug huzz mug yams mug larp mug unc mug cracked mug simp mug baddie mug bop mug lolcow mug