Wiktionary
n. 1 {{context|idiomatic|usually followed by (term with English)|lang=en}} A casual or partial familiarity; a relationship which is not close or fully developed; an inexact understanding (of something). 2 (context idiomatic English) Someone who is a remote or passing acquaintance.
Wikipedia
Nodding Acquaintance is the first demo EP by Enter Shikari. It was released in 2003 and was sold only at shows/via website.
Usage examples of "nodding acquaintance".
I wrote you a letter to express my sense of your action with the Cacafuego back in '01, and I very nearly posted it: indeed I should have done so, with the least excuse of a nodding acquaintance or a common friend.
Frank does me favors with his tractor now and then, and his wife gave me some jam she made last summer, but it's a nodding acquaintance.
He smiled at her, revealing teeth that had, at best, a nodding acquaintance with his toothbrush.
I had had more than a nodding acquaintance with amphetamines and other useful drugs during my days as a grad student.
They exchanged discreet but exceedingly knowing glances, and presently Hassan came up to Captain Aubrey and addressed some complimentary remarks to him in French, a language with which Jack had at least a nodding acquaintance, while the Bimbashi made some Turkish observation in a low, conciliating voice.
Strike up a nodding acquaintance for our doctrine with the works of old Mrs Trot, senior, and Manoel Canter, junior, and Loper de Figas, nates maximum.