Okay, this one can be very handy. Literally translating, it would be "Shitting and walking". But the meaning, is similar to "Water off a duck's back".
There's a pun with those Yogurts the makes your intestines work better and Johnnie Walker, as one makes you shit, and the other says to keep walking.
It is used to demonstrate that you don''t care about something.
- Ow, cê ouviu o que eles tão falando de você?
- Bah, tô cagando e andando mano.
- Quanto é o boquete?
- Na promoção tá R$ 5.
- Ow garçom! Me vê uma loura gelada?!
When something is extremely expensive, you can say that it is a "facada". Say you find a beer for 100 USD in a local buteco. You could say that that is a facada.
- Quanto tá a breja ae?
- A garrafa tá 100 dólares.
- 100 dólares? Tá louco?! Que facada!