yum yum Share definition Flag Blowjob. Used in 3rd world nations as a euphemism. Most commonly used in the sex trade of the far east like thailand. Yum yum 5 dollars sir. yum yum by Steve Savage June 1, 2007 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