noun
person who is still a virgin after turning 30
Slang term, often used humorously or derogatorily. Derived from やらず (without having done it) and 三十路 (age 30).
彼はもうすぐヤラミソになる。
He's about to become a 30-year-old virgin.
ネットでヤラミソという言葉を見た。
I saw the word 'yaramiso' online.