noun
Slangy onomatopoeic term for sex, mimicking the sound of a creaking bed and moaning. Used humorously or euphemistically.
See also: ぎしぎし
昨日は彼女とギシギシアンアンした。
Yesterday I had sex with my girlfriend.
隣の部屋からギシギシアンアンが聞こえてきた。
I could hear the sound of sex coming from the next room.