an activity deemed as so either amazing, incredible, joyful, pleasureable, fantastic, or epic as to have the appearance of fun yet deserving of a title fusing 'wonderful' with said action being 'fun' ; epic
dude: hey baby what do you think of having sex?
chick: you mean wonderfun? nothin better ;)
by freefaller December 15, 2009
When something is wonderful and funny or fun its wonderfun
OMG that was totally wonderfun, lets do it again.
by Mo3 March 14, 2005

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