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1. a REALLY, REALLY horny guy...or girl.

2. a dog that is humping your leg.
1. Gary was jerking off in the men's washroom again. What a horndog, eh?

2. Get this flippin' horndog off my leg!!
horndog by ze_kimster January 15, 2005
someone that is extremely horny and doesn't know how to control themselves
'you are such a horndog"
horndog by jwzjunk October 1, 2010
A guy who is always horny, and trolling for the ladies.
Who is that horndog trolling for sex on the boardwalk? Dat be Dehoux.
horndog by the truth2u January 24, 2011
An extremley horny guy
Rielly is a horndog around Sophia
Horndog by Urban Dictionary May 30, 2003
someone who all they can talk/think about is making out or having sex.
"Oh my gosh. He wont stop talking about making out."
"Eww, Ryan is SUCH a horndog."
Horndog by NotReady November 29, 2009
Awesome stoner webcomic about a horny dog.
I'm reading HORNDOG. It's THA SHIT!
Horndog by Tom Dubb June 13, 2011