Yu-yup
When a mere "yup" doesn't seem to suffice.
Pronunciation key: yuh-YUP
Pronunciation key: yuh-YUP
Examples
First person: "I want to have sex with that guy/girl."
Second person: "Yu-yup."
First person: "What a jerk he/she was."
Second person: "Yu-yup."
First person: "I want to have sex with that guy/girl."
Second person: "Yu-yup."
First person: "What a jerk he/she was."
Second person: "Yu-yup."