If you've not heard of the expression"Cream crackered" it is a slang phrase here in the UK which means "knackered"- or to put it politely - very, very tired. Cockney rhyming slang is particularly prevalent in the East End of London although some expressions like Cream crackered have filtered into wider usage. Essentially, Cockney rhyming slang is a group of phrases used by Cockneys as expressions instead of using the correct word.
Cockney rhyming slang is pretty simple to undertsand. Here are some simple famous examples:
Rosie lee means tea
Apples and pears means stairs
Trouble and strife means wife
Adam and Eve means believe
So you'll understand that now when I write I am cream crackered you know what I mean!
Anyway, time to go and finish my parental duties for the day. And when I get home I'm going straight to bed!