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LSFI: Let Shit Fuck Itself. Let things take care of themselves, especially if they are crappy things that one is not too interested in taking care of anyway. Alternatively, could also mean let those things go to hell, i.e. NOT take care of themselves, 'just don't bother me about them because I couldn't care less about them'. Variants include LTSFI, which can stand for Let This Shit Fuck Itself, OR Let That Shit Fuck Itself. A more aggressive variant is LTSFM - Let That Shit Fuck Me. This slightly changes the connotation from things just going to hell, to things becoming an active problem in one's own life, screwing with one.
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