not worth a tinkers damn

not worth a tinker's damn or not worth a tinker's dam  {adj. phr.},  {informal}
Not worth anything; valueless.
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.
Categories: {adj. phr.} {informal}

'not worth a tinkers damn' on video