This is an acronym that stands for "Wowza, be my mommy!". It is used when you see a hot girl, usually used for anime catgirls or just anime girls in general but it still can be used for normal women too.

Mercury retrograde is the act of taking a shit whilst mooning one or more human beings. Your day can typically being going well, according to your horoscope, until you are forced into witnessing Mercury retrograde. Performing Mercury retrograde will often speed the astrological cycle forward for the individual performing the Mercury retrograde, bringing about happy and fruitful times to come.