twat (portuguese). Same as cona, crica, paxaxa, pito, pipi (euphemism), pastel de pelo (brazilian portuguese), etc.
It is an extremely
rude word that should never be used in
front of a lady, unless said lady is a classless whore, or you really, really want to.
It cannot be used as an insult, but it can be used to make
someone feel insulted.
Cheiras mal, pá, vai lavar a rata! - You
fucking stink, bitch, go wash your
cunt already!
Com aquelas calças justas, vê-se-lhe a rata toda! He He He! - Those super tight pants give her a
camel-toe. Heh heh heh!