Definition of "funner"

"I wish I would have played basketball when I was out. It's a lot more funner."

1979, Juvenile Justice and Delinquency Prevention in Wyoming, United States. Congress. Senate. Committee on the Judiciary. Subcommittee to Investigate Juvenile Delinquency

Sounds like a great vacation, doesn’t it? It would be much funner, undoubtedly, to spend four weeks learning intensive Spanish in Guadalajara... but what do you expect for this price?

1992, Ana Malinow Rajkovic, Manual for (Relatively) Painless Medical Spanish

Every wardrobe needs an all-purpose cocktail dress, but these are often funner if you can find a retro party dress in flawless shape at a vintage clothing store.

2000, Julia Bourland, The Go-Girl Guide