This phrase is often employed when one accidentally touches someone inappropriately, say while brushing against a coworkers bosom while squeezing past in a crowded elevator, and is used to convey that the inappropriate touch was unintentional.
One should take care that this phrase is not mistaken for "No, Cuomo," which roughly translates to "
Please pardon my predatory and inappropriate behavior, for I am of
Italian descent and don't know any
better."