Sir Jee: "Yaahwiyaan", "Bongiyaan" and "Chawaliyaan" are plural forms of "Yaahwi", "Bongi" and "Chawali", respectively, and the persons, who utter these, are called "Yaahwa", "Bonga" and "Chawal", respectively.
"Yaahwa" and "Bonga" are almost synonymous, and imply utterly fool person. "Chawal"...