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1.
An expression used when a girl or group of girls that are particularly ugly walk by.
Here comes Jessica and her friends, christ, who let the dogs out.
by Seikundas September 21, 2004
 
2.
A term used to describe taking a shit.
Dad: "Who let the dogs out on the front lawn?"
Son: "Sorry, that was me."
by Adam Fink July 12, 2006