You can........?

[smudge]

Where does this saying originate from?

"You can pee on the fire now - I've had my toast".

[Quizmonster]

In a book called 'Brassbounder' by D W Bone, published in 1910, the following appeared: "It's 'Damn you, Jack, I'm all right!' with you chaps." This gave rise to all sorts of variants, such as: "I'm aboard, Jack. Pull the ladder up!" and so forth.
All of them suggest that the speaker is perfectly fine and satisfied and he couldn't care less that there are others still to be helped in the same way.
Your "pee on the fire" version is clearly just a more recent - because ruder - version. "I've got my toast and I don't care whether anyone else gets any toast or not. So, piddle on it!"

[Quizmonster]

When I said "Piddle on it!" in my earlier response, I was, of course, referring to the fire...not my toast!

[smudge]

Cheers QM - I knew what the saying meant, but just wondered where it came from & now I know! Thank you my dear. 

[Artful]

It was totally new on me when I read it in another post of yours smudge and I just laughed thinking you had made it up!

[smudge]

Hi Artful - I remember my husband mentioning this saying way back in 1963! It has always tickled me too!

It's just another version of: "I'm alright Jack".

[graemer]

smudge, can't wait to use your phrase! And thanks Qm as well

[smudge]

Thanks graemer - I was being polite in my question, so don't forget to use the correct phrase:

"You can p!ss on the fire now - I've had my toast"!

[jno]

graemer, it occurs to me that this phrase might better be tried out on a male; females might get a bit, er, heated.

[smudge]

Ha, ha, jno - now I never thought of that!

Ladies - do not try this at home!