An exclamation that is used to identify an unintended subtle sexual innuendo.
You are driving with one or more friends and pull into a parking lot. You see a sign that says "Use Rear Entrance" and exclaim "MAMMY! Alternately, your roommate comes back from class and is drenched from a rainstorm. She says "Oh my God, I am so wet!" and you say "Mammy!"
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