Just found a book and read the synopsis:
余命一週間と宣告された“たまらん”こと玉木走太
Is this equivalent in meaning to 洒落にならない?
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Sign up to join this communityIn this particular case, たまらん is his nickname. たま comes from his surname 玉木(たまき), and らん is "run" which comes from his given name 走太(そうた). Of course, it's a pun for 堪らん = 堪らない.