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1.
A situation to which a male must react in a particular way so as to preserve, exhibit, or confirm his heterosexual male status.
Girlfriend: That poor dwarf got kicked in the nuts by a chimpanzee wearing a karate uniform, and you laughed and cheered?? What's wrong with you?

Boyfriend: Sorry; penis obligation.
by Daggoth T. Rothri August 24, 2010