Bosstastic

The "tastic" form of the word boss, meaning, amazing, awesome, sick, ill, official, legit, neat, basically a variation of the word cool.

It's boss meets fantastic.
Bosstastic.

Bosstastic is commonly used when awesome, boss, sick, sweet etc. doesn't make it cut.

Therefore, next time, when you want feel like saying awesome but you're feeling more awesome than usual, use the word bosstastic.