An informal slang term for the male genitals or an insult to a to a person (especially a man) who acts unkind or dastardly. It is also a short-form for "Richard".
1. "I sucked my homie's dick all night long." (no homo)
2. "The bartender was being such a dick last night when he cursed my drunk friend out."
3. "My friend Richard prefers to be called 'Dick'."