The unnamed woman can be seen taking a leisurely stroll through the shop as she looks at products, before checking to see whether anyone is looking so she can do the deed.
She proceeds to lift her dress up, squat over a fully stocked chilling cabinet and calmly take care of her business, The Sun reports.
Perhaps even more worrying is the fact that another woman can be seen pushing a buggy just metres away while she looks at products on the opposite shelves.
Upon realisation of what the woman is up to, she brusquely walks away.
Though it is not clear precisely where and when the gross act occurred, some viewers believe the footage may have come from Russia.