Green’s Dictionary of Slang

1. a lightweight, affable but pretentious person.

1970		R. Boston Press We Deserve 129: There are evidently a good many people so fed up with politicians of every shade that they lap up references to ‘Smoothiechops’ [i.e. Roy] Jenkins.
1980		M. Bail Homesickness (1999) 413: Smoothie-chops. I could clip him one. I pity her, poor girl.
1999		Guardian G2 3 Aug. 2: He was no smoothiechops, but a good ol’ pro.

2. (N.Z., also smoothieboots) a womanizer.

1988		McGill Dict. of Kiwi Sl. 105/1: smoothieboots/smoothiechops a ladies’ man, extensions of smoothie; perhaps Dutch ‘smutte’, to slink, dialect English ‘smoot’, to creep, ‘smoot after’, to court a girl surreptitiously.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].