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The act of revealing you're genitals and shaft to perform in any sexual activity.
Boyfriend: "hey babe I'm gonna go.
Girlfriend: "why?"
Boyfriend: "I'm gonna go let loose the moose."
OR
"As the young lonely man was sitting in his basement he thought to himself, "now with mom and dad asleep I can let loose the moose."
by RESTERONER October 13, 2009
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