an articulated steam locomotive having a four-wheeled front truck, one section of eight driving wheels, a second section of eight driving wheels, and a four-wheeled rear truck.
Slang definitions & phrases for Big Boy
big boy
noun phrase
You there; man; mac •A term of address variously used with the intention to challenge, flatter, attract, etc: Want a little fun, big boy?(1910+)
An important man; biggie, big shot: He tried to shake down one of the big boys(1920s+)
An adult male; grown-up man •Most often used in rebuke: Cut that out—you're a big boy now