Green’s Dictionary of Slang

a devoted, if not always wholly successful, trend-follower.

1967		Oz 4 3/2: Rod Allen’s [...] panegeric [sic] of swinging London epitomises what is going wrong with the trendies.
1971		J. Mandelkau Buttons 17: The trendies quiver and strain to get at them.
1984		‘Derek Raymond’ He Died with His Eyes Open 80: The play was about tarts, blacks, clubs, drugs and riots; it also blasted the trendies.
1985		Tracks (Aus.) Apr. 5: The people that call themelves surfers now are nothing but big trends [Moore 1993].
1985		R.G. Barrett You Wouldn’t Be Dead for Quids (1989) 136: The trendy on the end of the lounge [...] introduced himself.
1993		B. Moore Lex. of Cadet Lang. 398: usage: ‘He thinks he’s a trendy but he looks like a poof’.
1999		N. Cohn Yes We have No 33: Slumming white trendies [...] adored the place.