1 definition by Garrigan Keeley
VERB referring to the acting of rubbing/humping one's crotch and/or bum on someone's belongings. The victim of a Dirty Dog is typically unaware, and it is typically done to a belonging that they would put their face on - often, a pillow. Some victims never know. Others are told by a proud and mocking perpetrator.
Every night, while her sister Fiona was in the shower, Deirdre would Dirty Dog Fiona's pillow. It was her only revenge for her older sister's bullying.
by Garrigan Keeley September 21, 2011