(short for "Sure-Whore") "Sho-ho" is an easy way to say OK, while still reserving the right to say whatever else is still really on your mind (which could be just about anything).
Jim: Hey Julie, take over for a minute, OK
Julie: Sho-ho (while Julie thinks to herself "I've gotta do every-damn-thing by myself around here anyway")
Jim: (Jim thinks to himself "What? I wish that ambivalent @#*%& would say what's really on her mind").