adverb, noun Informal.
Examples from the Web for yup
Yup, Evelyn and Donald Knapp are “ordained Christian ministers” suing for the right to discriminate.Refusing to Marry Same-Sex Couples Isn’t Religious Freedom, It’s Just Discrimination|Sally Kohn|October 23, 2014|DAILY BEAST
Yup, it was right there, within that eight-plex apartment building, where the Ebola outbreak in Dallas refused to die.
Yup, former Defense Secretary Donald Rumsfeld compared President Obama to an ape.Fringe Factor: Convicted Killer, Registered Sex Offender Runs for California Governor|Caitlin Dickson|March 30, 2014|DAILY BEAST
Asked about them backstage, Stinson allows an awkward pause, sips his drink and finally just says “Yup.”
Journals aren't interested in null results or "yup, we replicated that other study"; they want new studies with new findings.
He gave his head a few experimental twists, and then added in confirmation: "Yup, it's all right."Sube Cane|Edward Bellamy Partridge
“Yup,” Alan said, going up the stairs, sticking out his hand.Someone Comes to Town, Someone Leaves Town|Cory Doctorow
“Yup,” Seth went on, with a great assumption of unconcern which deceived nobody.The Watchers of the Plains|Ridgewell Cullum
"Yup," I said, squinting at the once-again two-dimensioned Red-head.The Animated Pinup|Lewis Parker
Golly, we nebbah hab to put up with dat nasty salt pork no more now, yup, yup!Picked up at Sea|J.C. Hutcheson