Depending on the Spelling it can be either Oyo or Oyho but please see below

Ohyo kumite is the application of kihon waza or a section of kata applied in a fighting encounter to examine specific core principles at work. Its function is to physically attest the application drawn from specific parts of a kata using the physical dialogue of torimi and ukemi practice. When applied to kata, the analytical practice known as kaisetsu in wado or bunkai in Okinawan systems, seeks to uncover in more functional and graphic detail the allusive pragmatism of self defence and protection from this wellspring of kata’s physical manifesto.

http://www.wadoworld.com/technical/ohyo/ohyo.html
_________________________
A man is but the product of his thoughts what he thinks, he becomes.

Ken