noun
sleeping under the stars; sleeping outdoors
Only when written 青かん
Colloquial term for sleeping outside, often without a tent. This sense is usually written in kana.
夏はよく公園で青姦するよ。
In summer I often sleep outdoors in the park.
noun
having sex outdoors; outdoor sex
Slang for engaging in sexual activity outside. The term is colloquial and somewhat vulgar.
夜のビーチで青姦するカップルがいるらしい。
Apparently there are couples who have sex outdoors on the beach at night.
Compound of 青 (ao, 'blue', here implying 'outdoors') and 姦 (kan, 'sex'). The exact origin is uncertain, but it likely arose as slang combining the idea of 'blue sky' with 'sexual activity'.