Top definition
Diagram showing all the personal relationships inside a given group. Useful when situations are tocotox (too complicated to explain), especially in polyamorous groups.

From the Greek Eros, god of love, and -gram, writing.
- Lisa? I'm sure I've heard her name before. Isn't she Mike's girlfriend's girlfriend?
- Look up the erogram!
by AurélienS April 08, 2011
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