bachelor party
A party thrown by the male friends of a soon-to-be groom. Jonathan didn't want a crazy bachelor party, so he and his friends went out for a few quiet drinks.
son of a gun
1. A mean or unpleasant man. Julie's ex-husband was such a mean son of a gun, it's no wonder she divorced him.
2. An emphatic expression of affection for a man one considers daring, mischievous, or tough. That son of a gun really pulled through for us when we needed him!
3. An inanimate object that is problematic. My car broke down, and I can't figure out how to fix the son of a gun!