From Wiktionary, the free dictionary
пи-пи́ • (pi-pí)
- (imitative) peep (characteristic call of chickens and other baby birds)
- “пи-пи”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
- “пи-пи”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010