Derived from the word "mutual." The word mooch-wahl refers to a person in a group of friends that does not fit in. Therefor a mutual agreement between the real friends occurs that the one said person does not fit in. They also are awkward and do not realize they are not like the group. That person would be referred to as a mooch-wahl. Friends always talk about others behind their backs in a group. If you are not observing this behavior you're probably the mooch-wahl.
Pronounced: Mooch "wall"
Enunciation: said like: bitch please
Person A: blah blah blah
Person B: blah blah blah
Person C: awkward statement (then leaves the room)
Person A: What a fuckin' mooch-wahl.