Definitions

1. adverb

an expression used to convey agreement or confirmation

“She asked, ‘Do you want to go to the movies?’ and he replied, ‘Yup.’”

2. interjection

an expression of agreement or confirmation

“Yup, I’m coming right over!”

3. verb

to confirm or agree, especially in a casual or informal way

“She yups the plan and they move forward with it.”