What does 「たまらん」 mean?


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?




In 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](http://ejje.weblio.jp/content/%E3%81%9F%E3%81%BE%E3%82%89%E3%81%AA%E3%81%84).

