nice!; very good!; so witty!; that's clever
Slang interjection used in response to a witty remark, pun, or clever wordplay. Abbreviation of 誰が上手いこと言えと言った？ (Who asked you to say something clever?). Often used playfully among friends or online.
A: This bread is so full, it's pan-pan (pun on 'bread' and 'full'). B: Nice one!
I couldn't help but reply 'dareuma' to his pun.