Yup means yes.
Yup is defined as slang for yes.
An example of yup used as an interjection is in the sentence, "Yup, I'll go to the supermarket today."
Slang yes: an affirmative reply
Origin of yupAlteration of yep
Origin of yupShort for yuppie
- (informal) A yes; an affirmative answer.
- (informal: a yes): nope
- Yale University Press
- Young urban professional