Have A Ball Meaning

Example :   The kids had a ball playing in the fountain.1973, Slade - Merry Xmas Everybody  Are you hanging up a stocking on your wall?  It's the time that every Santa has a ball  Does he ride a red-nosed reindeer?  Does a ton up on his sleigh  Do the fairies keep him sober for a day?1976, ABBA - Money  In my dreams I have a plan  If I got me a wealthy man  I wouldn't have to work at all, I'd fool around and have a ball1998, Baha Men - Who Let the Dogs Out?  When the party was nice, the party was jumpin' (Hey, Yippie, Yi, Yo)  And everybody havin' a ball' (Hah, ho, Yippie Yi Yo)'2011, Rebecca Black featuring Patrice Wilson, Friday  Yesterday was Thursday, Thursday  Today i-is Friday, Friday  We-we-we so excited  We so excited  We gonna have a ball today.