Wiktionary
tinker's dam
n. (alternative spelling of tinker's damn English)
WordNet
Usage examples of "tinker's dam".
Unlike her father, she did not give a tinker's dam if the till were full at the end of the day.
I don't give a tinker's dam what you may have done in the past, and neither does the War Department.
I was drowned out by a prolonged fit of princely coughing, the result of outraged smoke going down the wrong way, which gave him time to digest my warning, and emerge mopping and wheezing to announce hoarsely that he didn't give a tinker's dam for courts martial, or words to that effect, and not a whisper was to be breathed to military superiors or anyone else, was that clear?