*I wrote these off the top of my head. I am sure there are a lot more.
Aliento de dragón – bad breath
Baboso – an idiot
Bola de billar – a bald person
Bola de manteca – a fat person (butter ball)
Bruto – stupid
Bueno para nada – a good for nothing
Burro – a dumb person
Cabeza hueca – no
