NOSfusion 

a) The feeling you get when you press the "NOS" (N2O GAS AKA nitrous oxide) button in your vehicle

b) Pure Euphoria via Nitrous Oxide released into your "car's" engine

"Hey Topher! Last night, for the first time, i felt NOSfusion when i took my ride on a midnight test drive!"

NOSfusion by Topher G. April 2, 2007

Cosfusion 

When you mix two cosplays / characters together.

Did you see that Pikachu and Hulk cosfusion? It was really odd, that guy was really buff.

Cosfusion by <Marduk> September 18, 2018