Yup has 5 different meanings across 2 categories:
Intj · Proper Noun
A yes; an affirmative answer.
"At the networking event, I met several yup who were discussing trends in high-end real estate development."
Clipping of yuppie.
Initialism of young urban professional.
Yes.
"Yup, I'll be there on time for the meeting."
Initialism of Yale University Press.
"The citation at the end of that academic paper lists Yup as the publisher for the edited volume on medieval literature."