person proud of their singing voice
Refers to someone who boasts about their singing ability, often in a lighthearted or self-deprecating way.
He always becomes a proud singer when he goes to karaoke.
amateur singing contest
Often used in the names of local or TV talent shows where ordinary people compete by singing.
An amateur singing contest was held at the neighborhood association.
Standard spelling; のど is often written in kana for this word.
Kanji spelling for のど; less common but still seen.
Compound of のど (throat/voice) and 自慢 (pride/boast). The contest sense likely derives from the idea of people proudly showing off their voices.