funnest
Adj. non-standard superlative form of "most fun". Meaning that a given something (noun) provides the most mirth or entertainment than any other something.
Example:
The funnest way to contract diseases usually involve three women, two men, a broken condom, a goat, and a cheese grater.
The funnest way to contract diseases usually involve three women, two men, a broken condom, a goat, and a cheese grater.