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Similar to the common practice of using a rubber dental dam as a barrier against germs and disease while performing oral-anal sex, the Ham Dam uses the same concept but instead of rubber one uses a thin slice of honey baked ham.
"Dude, I would totally lay down the Ham Dam on that girl."

"After I gave Erica the Ham Dam, I slapped that thin slice of honey-baked on some potato bread and ate a Ham Damwich!"
by 240HamDam May 22, 2009
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