The definition of a son of a bitch is a term used to describe someone who has done something bad, displeasing or angering.(noun)
When your friend steals from you, this is an example of a situation where you might consider your friend to be a son of a bitch.
Son of a bitch is defined as a curse word or vulgar expression used to express frustration and anger.(interjection)
When you slam your hand in the door, this is an example of a situation where you might say "son of a bitch!"
See son of a bitch in Webster's New World College Dictionary
See son of a bitch in American Heritage Dictionary 4
Vulgarnoun pl. sons of bitches
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