An unforseen event in which your body's natural reaction is to contract the sphincter, leaving one a feeling of exhilaration then procedding with complete relaxation
When one is beyond any feeling of frustration, anger, defeat, in any shape or form, their anus is puckered with these feelings.
Guy: Brett you okay?
Brett: No fuck you! You fucking cheater! I should have won!
Guy: Man, your anus is really puckered. You have quite a puckered anus.