Some obfuscated bullshit

gistfile1.js

function UNPACKER(U5C) {//Unpacks string packed arguments
//backtick and 3 arguments 
//first argument, is length +5
//second and third argument is distance from current index..
//these arguments are in character form..
    for (var b5C = "", z5C = 0, o5C = function(U5C, H5C) {
        for (var x5C = 0, J5C = 0; J5C < H5C; J5C++) {
            x5C *= 96;
            var Z5C = U5C.charCodeAt(J5C);
            if (Z5C >= 32 && Z5C <= 127) { //from 32 to 127
                x5C += Z5C - 32;
            }
        }
        return x5C;
    }; z5C < U5C.length; ) {
        if (U5C.charAt(z5C) != "`")
            b5C += U5C.charAt(z5C++);
        else {
            if (U5C.charAt(z5C + 1) != "`") {
                var r5C = o5C(U5C.charAt(z5C + 3), 1) + 5;
                b5C += b5C.substr(b5C.length - o5C(U5C.substr(z5C + 1, 2), 2) - r5C, r5C);
                z5C += 4;
            } else {
                b5C += "`";
                z5C += 2;
            }
        }
    }
    return b5C;
}