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kit-kat a midget if that ass soft I break her off

kit-kat is slang for fingering a girl with 4 fingers (kit-kats come in packs of 4 sticks) He's basically saying that he'd even have sex with a midget if she looked decent.
i'll even do a midget if her ass is soft...... kit-kat is a bar you literally break off so its' used here metaphorically