FIIL

Acronym for Fuck It I'm Leaving. It's a WWII (?) military reference for when a military member was about to finish his/her time of service. (this is what my mother told me anyway and she used the term). Also a handy term when one has given one's notice at work or about to retire.
Employee about to retire:

"Quarterly earnings reports? FIIL!!! Don't care anymore"
by Random Ax June 16, 2022
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