Top Definition
A man fits his penis and both nuts into the woman's vaginal canal.
You never have to worry about your junk getting cold when you have puppies in the tub.
by Moonfrog February 11, 2004

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When a man gets both of his testicles in a womans ass. Sometimes accompanied by his penis, fingers, or other sexual objects. It is spoken that way because they say it is as difficult as keeping multiple small Canine's in a bathtub.
I went for the old "puppies in the tub", and now my left nut is sore.
by Chedabob February 04, 2008

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