[wanko-ru](n) (See ワン切り) one mobile telephone ring (used by companies, usually sex-related, to register a phone number on a mobile in the hope people will return the call) (wasei[Add to Longdo]
[wankoin](adj-f) one-coin (i.e. able to be paid for with only one coin, esp. a 500-yen coin, sometimes a 100-yen coin); costing 500 yen; costing 100 yen[Add to Longdo]