An exclamation or ejaculation expressing disquiet, disgust or disappointment with a given situation. "Rats arses" is an acceptable substitute for more polite occasions.
As in "Rats' cocks! That was my last fag."
Or simply "Rats' cocks!" when, for example, treading in a dog shite.
Ralph: So this morning, I was in such a rush that I grabbed any two socks I could find and put them on. To my dismay, I noticed that my left foot was covered in something wet...turns out I had accidentally grabbed my Ratsock.
When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).