porch pigeon
Gossiping old ladies who sit on the front porch or in the front yard and make nasty comments about you behind your back, especially if you are their neighbors. If there is some sort of neighborhood association or co-op which you both share, you can count on these porch pigeons actively working towards getting you evicted.
Watch out for those porch pigeons on the way out, they'll rat on you if they see you smoking dope.