This is the 5915th most frequent Portuguese word.
bicho
"Bicho" means "animal," "bug," or "creature" in English.
Here, 'bicho' is used to refer to a creature or animal in general.
Eu vi um bicho estranho no quintal ontem.
I saw a strange creature in the yard yesterday.
In this sentence, 'bicho' is used informally as a term of address to someone, equivalent to 'buddy' or 'mate'.
Bicho, você não vai acreditar no que aconteceu!
Buddy, you won't believe what happened!
The word 'bicho' refers to a specific type of insect, in this case, the 'woodworm'.