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1.
1. King of Ancient Mycenae (City-State in Southern Greek Peninsula) during the Trojan War. Right after he came home from that war, his wife, Clytaemnestra, and his cousin, Aegisthus, conspired against and killed him. (In many accounts, Clytaemnestra stabbed him in a bathtub.) After this, Agamemnon's son, Orestes, killed his mother and Aegisthus as retribution.
Agamemnon's homecoming is a major theme in Homer's Odyssey. The "Agamemnon incident" is brought up numerous times, especially when talking about people coming home, traitors, and the faithfulness of wives.

2. (Verb) To brutally kill someone.
1. "Dude! That's all well and good, but did you hear about what happened to Agamemnon? Oh snap! That bitch killed him!"

2. If you keep saying that, I'm totally gonna Agamemnon you.
by JCD II March 21, 2006
 
2.
A word you yell to break an awkward silence.
**awkward silence**

random person: AGAMEMNON!!
by agamemnon. January 17, 2011