Top definition
When your penis or any other part of you body that extends past your face when standing in an upright position, rises or erects without your consent.
Looking at her breast gave me an unexpected suboiancy.

At a college dorm:
guy 1: "woah!"
guy 2: "whats wrong man?"
guy 1: "I have suboiancy right now."
guy 2: "why?"
guy 1: "Idk"
guy 2: "ur gay."
by Gino_314 February 22, 2009
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