1.
Common mistake for "fantastico," the word for "
fantastic" in a number of languages.
2. Fantastic + Magical. Often as a backwards attempted explanation for
definition 1.
1. Googling "We'd be so fantastical" reveals that
Lady Gaga has inspired this mistake 70,000+
times. (She's actually saying "fantastico")
2. Many other definitions on Urban
Dictionary :)