Zonkeys are a cross between a zebra and a donkey and it creates this funny striped donkey.You can cross a donkey with many similar animals such as: ponys, horses, donkeys and mules.
Source: Zebra web sample code.org
Bumfuzzle is a synonym for dumbfounded used in in the late nineteenth century. Its also a really funny sounding word.
Snickersnee comes from the dutch phrase stiken or snijden which means to cut this late evolved into the word snick and then became the funny word snickersnee
Fartlek is what runners do when they switch from sprinting to jogging. ALthough it seems like it, this has nothing to do with flatulence. Its just a funny sounding word