bucko
/ˈbʌkəʊ
/noun (plural buckoes or buckos) informal
A young man (often as a form of address): I know you, my bucko, you’re a troublemaker...
- ‘Okay that's enough information there, bucko,’ Torrie yelled from the other side of the wall but not looking, trying to keep what was left of her sanity.
- Choose one liquor and stick to it for the night, bucko.
- Do the crossword puzzle yourself for once, bucko.
Origin
Late 19th century (originally nautical slang): from buck1 + -o.