Maydoo's are the weird, creepy-ass people that live next door to you. Every time that you see them, you witness something unexplainable, like something that only scumbag idiots may do (maydoo).
Look at that cracked-out maydoo in her 1970's polyester shit-brown dress sweeping her dirt yard with that busted-ass broom barefoot.
That dirty-ass 37 year old maydoo knocked on my door this morning wanting to play his jinky-ass atari on my plasma!
The acting in a fashion that reflects insanity and a complete lack of responsibility and control. Maddoggery often occurs in places that such acts should not occur. Such places include heritage trails, funeral homes, churches and WWII concerntration camps. Maddoggery is a state of mind, not just a one off act of irrational behavior