What does SUM1 mean?

Someone

SUM1

Other definitions of SUM1:

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SUM1:

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More slang terms:

GWP

GWP

Gift With Purchase

ICEDI

ICEDI

I can't even discuss it

IITYWYBMAD

IITYWYBMAD

If I Tell You Will You Buy Me A Drink

Prone Bone

A slang term for a sexual position in which one partner lays on their stomach and the other mounts and inserts from behind.