Top Definition
A place where a shirt is not required, and often usually preferred off. In such an environment one often tells females of the rule, hoping but usually to no avail to see a nice pair of moon balloons.
Wow those guys at 120 Cityside sure do promote the shirts optional rule.

Tom Doran does enjoy to use the rule of shirts optional.
by GriffeyJR June 03, 2009

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