In the personal ads in a local free publication I found six categories:
Women, Gals, Yipes
Men, Guys, Yipes
Gals and Guys are gay categories, judging by the ads themselves, so I guess I assume that Yipes are Bi of some sort. Those ads don’t make it clear, though. Neither Yipes is written in all-caps as I would expect an abbreviation of some sort to be.
Problem is I can’t find a definition for Yipe or Yipes at UrbanDictionary or through Google that makes any sense in this context.
So what’s a Yipe?