がしゃどくろでしょう
がしゃ髑髏でしょう
gasha dokurodeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of がしゃどくろ

1. Probably a skeleton.; Likely a skull.

Polite
Presumptive
Conjecture
Usually Written in Kana