There's no flies on him

No tiene nada de tonto. Viene esta frase de aquel que es muy vivo que por encontrarse en constante actividad no pueden las moscas posarse sobre él.

The phrase finder nos trae un poco de historia: 'In the 19th century, to say that "there are no flies on him" of somebody meant that the person was alert and active, probably by allusion to cattle that move around enough to deny flies a landing place.'

Any comments? slangmagazine(at)gmail.com or post a comment in this blog. Thanks!