son of a gun

Son of a gun is defined as an expression of surprise, disappointment or frustration.

(interjection)

An example of when you might say "son of a gun" is when your dog surprises you by actually listening to a command he's ignored before.

See son of a gun in Webster's New World College Dictionary

Slang a euphemistic alteration of son of a bitch: a much milder term, with overtones of indulgence, familiarity, etc. when used of a person

See son of a gun in American Heritage Dictionary 4

Informal

noun pl. sons of guns

A person; a fellow: That son of a gun knows how to sell cars and sell them well.
A rascal; a scamp: That son of gun is always playing practical jokes.

interjection

Used to express annoyance, disappointment, or surprise.

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