son of a gun noun 2exclamation 1forms 2 noun2 •(euphemistic) son of a bitchThat son of a gun stole my wallet! •Used encouragingly or to compliment.You son of a gun, you did it! exclamation1 •(euphemistic) Used to express anger, contempt, disgust, astonishment, disappointment, etc.Son of a gun! I just got stung by a wasp! formssons of a gun · sons of guns