Borrowed from Russian вопль (voplʹ).
во́пъл • (vópǎl) m
- cry, wail, howl, scream
- “вопъл”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
- “вопъл”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010