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1.
a dog who likes to hump dogs of the same sex.
look at the gay dog oliver, he's humping freddy.
by SHANNON R. September 02, 2005
 
2.
Someone who is disliked by others and/or by a certain group. Can also mean faggot or any other homosexual insult.
US -Ah! Your just a fucking gay dog
US -Go away dirty old gay dog!
UK -Bloodyhell! Your nothing but a gaydog!
by Corben Dallas May 28, 2004