noun
Vulgar slang for a sexually promiscuous woman; often used as a derogatory label. The male counterpart is ヤリチン.
See also: ヤリチン
あの子はヤリマンだって噂されてる。
There's a rumor that girl is a slut.
ネットでヤリマン呼ばわりされた。
I was called a slut online.
Compound of やり (stem of やる, 'to do' or 'to have sex') and マン (slang for 'vagina'). The exact origin is uncertain, but it emerged in modern vulgar slang.