not worth a tinker's damn

not worth a tinker's damn или not worth a tinker's dam  {adj. phr.},  {informal}
Ничего не стоящий; бесполезный.
As a bricklayer he was not worth a tinker's damn.
I am not familiar with the subject so my opinion would not be worth a tinker's dam.
Категории: {adj. phr.} {informal}

'not worth a tinker's damn' on video