yessum

contraction

1. (US, contraction, dated, dialectal, informal)Used to express agreement with a woman (and, somewhat less commonly, a man): yes, ma'am.

   “"I would like to sit down in your shade beside you," said the Tall Man. "Yassum," said the Little Bit of a Girl. […] "Why do you have the crutch?" asked the Tall Man presently. "Yassum, the crutch, the doctor he gave it to me, yassum," said the Little Bit of a Girl.”

   “"Yessum." Luster said. "We coming. You done played hell. Get up." He jerked my arm and I got up.”

   “Little Chuck's face contracted and he said gently, "You mean him [a louse], ma'am? Yessum, he's alive. Did he scare you some way?" / Miss Caroline said desperately, "I was just walking by when it crawled out of his hair … just crawled out of his hair—"”

2. (Australia, alt-of, alternative, contraction, informal)Alternative form of yes.