A yummy way to agree with something, or to acknowledge someone.
Josh: "can I bum a cig?"
Phil: "yum yum"
by PsychoWhiteHoe May 20, 2018
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kosher marshmellows, chips, or other treats and goodies fit for meadocrashing
by foir July 20, 2011
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When a guy jizz in your mouth and you pass round the cum equally between your fellow colleagues in the room so everyone has a bit of protein before the big night on the town
Patricia: shall we yum yum this jizz in my mouth

Justine: yes okay

Jeff: yes I'm hungry before the night out. Please save me a piece
by Sauly bee July 08, 2020
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