"Bucko" is a slang term that is used to address or refer to a person, usually in a playful or friendly manner. It is similar to saying "hey buddy" or "pal."
Full definition
Obviously, just starting out (with absolutely nothing) we could not afford to
spend bucko - bucks on artwork, but I knew I wanted something original and quirky.
Lots of pejorative invective there,
bucko.
UPPAbaby VISTA stroller — I love this stroller because it's easy to plunk in
the bucko, and go» wan.
Instead she said, «Listen,
bucko, right now we're at zero percent.
The Nendodroid kawaii train doesn't have any brakes on the 3DS this time,
bucko.
- Rent or Buy: If you don't already own it, it's long gone,
bucko.
Those ducks sure aren't coated in salad dressing,
bucko.
The adjuster might end the conversation and say, «All right, that's a very big number,
bucko.