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As far as I know it should mean slow. But I haven't found this word on any online or offline dictionary.
たとえばゆるい幸せがだらっと続いたとする
So the word is used in the song Solanin by Asian Kung-Fu Generation. The first time I heard this word was in the 1st episode of the anime "The Daily Life of High-school Boys". It was subtitled as slow. However, since then I haven't found it on any dictionary; I looked up online but still in vain. Does this word really exist and if it does, what does it really mean?
「だらっ」 is defined in several sources.
As per プログレッシブ和英中辞典(第３版):
1 〔粘っこい液体が垂れる様子〕
赤ん坊はだらっとよだれを垂らしていた
The baby was drooling [slobbering].2 〔だらしない様子〕
だらっとする
⇒だらける
だらっとしてないで勉強しなさい
Stop loafing [fooling about] and start studying.
Similarly, this page has:
力なく、または、だらしなくたれ下がるさま。
液体が不快な感じで、したたるさま。
「だらっ」 is etymologically and semantically related to だらだら
sluggishly; endlessly; lengthily
Onomatopoeic or mimetic wordleisurely; idly; slowly; slovenly
Onomatopoeic or mimetic word
話は三時までだらだらと続いた。
The talk dragged on till three o'clock.
In your sentence, it means something along the lines of slowly, sluggishly, endlessly.
