The funny thing about idioms is that sometimes its literal meaning is totally absurd and non-sense. That is visible in “Pequeno dicionário ilustrado de expressões idiomáticas” – “The little idioms illustrated dictionary”. Below you can see a couple of the images:

Sem pé nem cabeça                 Pagando o pato

To check more images visit http://imasters.uol.com.br/artigo/3220

Check the meaning of the idioms in the article:
Can you tell me what their literal meaning are? (Check the images)

Quebrando o pau: To get into a fight, to get very angry and aggressive.

(Estar) Com a faca e o queijo na mão: To have power and/or resources necessary to solve a problem/situation.

Trocando as bolas: To get confused and probably mistake something or someone for another.

Segurando vela: To be the only person accompanying a romantic couple. To be the third wheel.

Uma mão lava a outra: You do me a favor, I’ll do you a favor. You scratch my back, I’ll scratch yours.

Mala sem alça: A very annoying person.

Tirando água do joelho: To pee.

Sem pés nem cabeça: Totally absurd or non-sense.

Pagando o pato: To take the guilt on something, or to get humiliated.

Na mosca: Bullseye!

Batendo as botas: To pass away. To kick the bucket.

Com a corda no pescoço: Under a lot of pressure.

Enchendo lingüiça: To write or say things that are not relevant, just to fill space or time.

Chá de cadeira: To have to wait sitting for a long time.

Mão na roda: To be helpful.

Entrando pelo cano: To get into trouble.

Pendurando as chuteiras: To quit doing something, to retire.

Engolindo sapo: To get scold with no reaction.