'course
adverb
- Indicates enthusiastic agreement
Wiktionary
adv
- Ellipsis of of course.
““Huck, have you ever told anybody about that?” “’Bout what?” “You know what.” “Oh—’course I haven’t.””
“"[…]she'd probably find something wrong with him too. Wouldn't you?" He looked at me. "'Course," I said, examining the picture before exclaiming very seriously, "His hair's too greasy."”