what exactly is a "saline need"?

[Cooliegirly]

I may have the spelling of "saline/salian"wrong because I've only overheard people using it.

[Yankee]

Hi Cooliegirl

Assuming the word you heard is saline, the best I could do without further context is to give you dictionary definitions of the words saline and need (which I assume you already know), and guess that the phrase refers literally to a need for saline (salt) or possibly a need for a saline solution.
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[Cooliegirly]

not really a need for salt