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an activity in san francisco where a group of drunken males (gaysians) run around pulling the fire alarms inside the red bird houses found almost on every street corner.
We went birdhousing last night and it was fucking crazy, we had to hide in an alley as the fire truck drove by.

Dude we can't go around birdhousing anymore we're gonna get arrested.
by heatxsink April 22, 2012
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