1. Penis with a bulbous deformed head that is disproportionately larger than the shaft., 2. Used to describe a loud or obnoxious person. Most effective when preceded with a traditional expletive, (i.e. "You fucking Yam-hammer"), 3. An aggressive consensual sexual act that involves a sound beating and/or pummeling.
when having sex the woman is laying on her back with her legs together and straight up in the air over ther head (thus appearing like a hammer) and you continously plunge into going so deep she yells up to the gods.
Girl 1: My man did me from behind last night and it was so good that it felt like he took me to the heavens.
Girl 2: You just reached the heavens? My boyfriend did The Hammer of the Gods on me and I reached Olympus.
When a guy penetrates a girl really hard while singing any song by SHINee, BIGBANG, or SNSD.
Guy 1: "Hey man, you sound really hoarse! What's up with your voice?"
Guy 2: "Yeah dude, I gave my girlfriend a Koreanhammer last night! I didn't know I could sing that well!"