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1.
When two hermaphrodites (hermies or hermdoggers) have intercourse while penetrating eachothers vaginas with their penises.
Pat and Chris were hermdoggin under the jungle gym during recess.
by Balmoral Drunks August 31, 2010
 
2.
(v.) To take twelve or more male penises at one time
Man, that test bent me over. I was pretty much hermdoggin it.
by Lots of Herms January 29, 2011