The art of getting fucky, when things get dark/eerie and words can not explain the level of greatness (possibly when you are indulging in funtivities that are illegal). Banastical can be used to describe the moment or time. This phrase can be used at any time of the day but you have to be positive, not positive you have to be HIV positive that it is a Banastical moment.
Banastical moments come around a lot on Wensdays when consuming large quantities of alcohol and playing drunk bowling with great friends in Pullman Washington. Banastical describe the level of greatness and excitement that everyone has when playing the game of drunk bowling. When this term is used you could possible be the best time of your life.