mana_trinifinally uploaded a video. I guess the song isn't as funny if you don't understand what it is about, but the whole ending (from the "numero zero") is a purely Mahorais invention.
Basically the song says, a little green mouse is running in the grass. I catch it by the tail and show it to these gentlemen. These gentlemen say to dip it in oil, dip it in water, and it'll make a hot snail!