noun
semi-erection; partial erection
Colloquial term for a penis that is not fully erect. Often used in casual or sexual contexts.
See also: 半勃起
朝、半勃ちのままトイレに行った。
In the morning, I went to the bathroom with a semi-erection.
彼は半勃ちの写真を送ってき
He sent me a picture of his partial erection.