Adj: Word used to convey a feeling of complete awe; wonder; amazement. Word was coined in the early 2000's by joining 'Fucking Spectacular' into a much easier and shorter word, 'fucktacular'.
Adj: "Watching the New England Patriots win their 2nd Superbowl Championship in 3 years was a truly fucktacular moment."
funktacular is a word used to describe events or material goods which are either retro or good, or perhaps even a little bit of both. Can be used similarly to groovy, and when used with a negative tone can also be used to indicate that something is funky in a negative way.
That jazz club was funktacular, i had a great time.
Good lord man, your shower is funktacular, you should really get a new one.