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A person that eagerly tries to get the ball rolling on your house warming party. House warming activists are very tenacious and often ask you 'when is your house warming party?' every day.
Duder 1: "Dude you moved in like 2 days ago! He's already asking you about that?"

Duder 2: "Yea dude I see him every day at lunch and the first thing he says is 'When's your house warming?'."

Duder 1: "Damn son! You got yourself a house warming activist right there."
by westfalia March 05, 2010