Some friends were hotboxing a car, having a coherent discussion about a topic that is no longer remembered, when one of the friends remarked, "...a spontastic lightning strike."

The root of the word is a bit of a mystery, but most likely it is a stoned mixup between spontaneous and fantastic. Such can be taken as the meaning.

A Bloomer is someone with a bright outlook on life who is optimistic in nature. Bloomer's frolic in every opportunity to be happy and try to make the most out of life. The opposite of a Bloomer is a Doomer. The term Bloomer originated specifically as a counter to the Doomer on sites especially like 4Chan.