or, you could bend a natural harmonic, E.G. Fret the D string at the 5th fret (G) then hit the fret wire of the 17th fret with a finger on your picking hand.

When you get the harmonic - bend the string... and voila.... a harmonic bend. I also wondered if it could mean a unison bend or something, with definitions varying so widely... ?

I wouldn't bend my guitar neck if I was you... I might say I did it to sound cool though.... :)