What does UM mean?

Expression of hesitation

UM

Other definitions of UM:

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How to use the term
UM:

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More slang terms:

IYWAWDDIY

IYWAWDDIY

If you want anything well done, do it yourself

ABK

ABK

An acronym that stands for "Always Be Knolling". Knolling is the practice of laying out related objects in parrallell lines and 90° angles for the sake of a picture.