It is shorthand for 'I may not be perfect, but I'll be making no efforts to improve, so be warned', in the same way that people used to say 'take me as you find me'
Guy 1: Dude, I fucked that chick that I met off of Facebook last night after seeing her hot pics.
Guy 2: Were her tits as big in person?
Guy 1: Hell yeah. What you see is what you get.
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