To take a brief nap. Ever notice how cats tend to fall asleep, wake up shortly thereafter, and then doze off again? Catnaps are referred to as such due to their brief and sometimes random nature.
Person A: "Say, is Heather awake?"
Person B: "No, she said she was tired and wanted to take a quick catnap.
Slang for 'arse', 'bum' etc. Usually used to refer to a female arse but can be used in conjuction with an insult to anyone.
"She'd get it up the canapuda!"
or
"He definately takes it up the canapuda!"
or
"Why won't you let me do you up the canapuda?"
or
"Canapuda, ooh ooh, canapuda, ooh ooh!"