(Noun) In Spain, colloquially, a menacing or disgusting unspecific animal. Usually said of some insects, snakes, toros, dinosaurs, etc., but also of almost any animal from that point of view. If it's said of a person, it could also mean something like mischievous, bad or threatening big, dangerously effective.
Ronaldo está hechco un mal bicho ultimamente: balón qu e toca, balón que manda al fondo de la red.
Actually means "snake", but it means "dick" to the people of the caribean(esp. to ricans). Its refers to worms and caterpillars in mexico.
(weird huh?)
1. The bicho in the grass might bite you!
2. yo girl, i have a big bicho!