Could some nice kind person please tell me what all this 'roofless' is about?

Is it simply an incorrect pronunciation and spelling of ruthless?

Thanks in advance. xx

Yes, you have answered your own question, it's his pronunciation of 'ruthless'

It's just a play on words as to Bear's trade as a roofer.

Thanks guys.

When he shouts it every few seconds its beyond irritating, on a par with Heavy's Booms.