To do a task quickly before something catastrophic happends

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.

mostly used to replace the word, i guess, in a fun way. Can be used to express anger, sadness, happiness or any emotion involving confusion or tiredness.