What is Headdog?
1.
A pounding headache, usually after a night of excessive drinking.
I want to get breakfast, but I have such a massive headdog.
See
2.
An occurrence of one's head coming into contact with a dog, usually with force.
Instances where a headdog is necessary:
Guy: GAWWD, I AM SEWWWW DRUNK!!!!! *headdog*
Dog: D:<
See