to take a quick/incomplete shower
Você já tomou banho?! Não se passou nem 4 minutos! Tomou banho de gato?!
You already showered?! Not even 4 minutes passed! Did you take a bird bath?!
The expression tomar banho de gato (literally "to take a cat's bath") draws on the way cats clean themselves: they do not plunge into water but simply lick their fur, dabbing at it bit by bit.
Falando's Idiom Trainer teaches you to recognize idiom meanings and create sentences using them, so you can speak like a Brazilian.