A person who is a total creeper and acts like a creech. They like to creep around. Very creature like. Usually also described as "creeper," "creech," or "cretin." Meeching is the act of one doing meech-like things.
Mitch: Dude why you meeching?
Alec: Cause I meeched into town last night and meeched around in the neighborhoods.
Mitch: You are such a meech.