Phoentic Spelling would be (Ch-erp or Ch-urp)
In this case the Term is "Chirp Chirp" Originally from the Cincinnati area of Ohio State. Later making its way closer to the Town of Akron and now commonly used around the NE side of Ohio.
Another definition similar of this can be "Mac & Cheeze" or "Steak and Potatoes" (Look at Definition/Example for reference to Steak and Potatoes)
A Hot girl walking up the street or sidewalk past you--you look back and look at her body and in an outside voice yell "Chirp Chirp"! or can also be followed by DayUmmmm! or Damnnnnn!
An example of Mac and Cheeze would be two girls walking together one not as attractive as the other and the hotter one would be the Mac cuz you want to"Mac" that and the other girl is the Cheeze, not saying she cant be good looking just not as good as the Mac....the Cheeze can be good looking if its not burnt around the edges.