3さん9きゅうMeanings1interjectionthank youinternet slangCasual internet slang for 'thank you', derived from English 'thank you' via number goroawase. Used in informal online communication.See also: サンキュープレゼントありがとう!39!Thanks for the present! Thank you!手伝てつだってくれて39。Thanks for helping me out.