What does YUP mean?
Yes
Other definitions of YUP:
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How to use the term YUP:
There are no example uses of YUP at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

SWA
So what ass

SMITHWAWS
Smack me in the head with a wooden spoon

NMTN
Nevermind that now

4EAE
ForEver And Ever