fun on a bun

Etymology
Chosen for the rhyme.

Noun

 * 1)  Great fun; something very entertaining.
 * 2) * Giselle Renarde, The Lesbian Diaries Volume 2 (page 437)
 * There were picnic tables set up on the factory's sprawling front lawn, so we each ordered ​a mushroom burger topped with caramelized onions and grainy mustard on a bed of baby greens. Not exactly fun on a bun, but surprisingly delicious.
 * 1) * J. J. Brass, I Spy a Courtyard Casanova
 * And when Rexy told me an old friend lives right downstairs I thought, well isn't that fun on a bun? When I'm travelling the world, just me and my camera, Rexy won't get too lonely.
 * And when Rexy told me an old friend lives right downstairs I thought, well isn't that fun on a bun? When I'm travelling the world, just me and my camera, Rexy won't get too lonely.