Fun Zone doesn't really have any lyrics. People Occationally say "yeah" and other similar phrases, but it's generally just music. In the movie, it played in the background when Stanley rode out in the miniature fire engine at the beginning of an episode of Stanley Spadowski's Clubhouse. The song is approximately 1 minute and 45 seconds long, but it did not play in it's entirety in the movie.
[ Lyrics from: http://www.lyricsfreak.com/w/weird+al+yankovic/fun+zone_20145793.html ]