What does SUM1 mean?

Someone

SUM1

Other definitions of SUM1:

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How to use the term SUM1:

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More slang terms:

Cringe

Cringe

A name given to all actions that would make onlookers wince in embarrassment.

AYSOS

AYSOS

Are You Stupid Or Something

FSM

FSM

Female Seeking Male

SLR

SLR

Single Lens Reflex