Top Definition
1. rule or domination by a the person with the largest penis.

2. a political system, state, etc. dominated by the person with the largest penis.

3. a way of determining order by the size of the penis of the participants.
Allan: So, who gets to go first ?
Bob: Definitely me, by right of penisism.
Allan: Huh ?
Bob: My penis is way bigger than yours Allan.
Allan: ...
by Ragnarok7000 October 29, 2009

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