1996 May 5, Robbie Bettison, “Premier league”, in alt.sports.soccer.european.uk[1] (Usenet):
Can't wait until the summer to see how many unloyal 'players' jump ship (spoilt, money grabbing, unpassionate, W-ANCHORS).
2005 April 22, Tim Streater, “Re: Security Update 2005-004”, in uk.comp.sys.mac[2] (Usenet):
Agreed. It's when the response is "and please don't top post", without explanation, as if the poor poster has farted in the lift, that I am inclined to think, "what a w-anchor".