This is a term used on the East coast. It originates from Ohio. Comes from unMenchionably Smart.or An MENCHionably smart. Sometimes used to describe Creative people.
John: matt gets an A on like every single paper in math, plus he rig my locker to open witha remote.
Kit: "that Matts a regular A Mench!"
Verb: Aubrey: I at Speacial K chocolate Delight this morning for breakfast and I've been A Menching every one of my tests all day