Green’s Dictionary of Slang

second-rate, unpleasant; lit. having the characteristics of a ponce.

1970		A. Sillitoe Start in Life (1979) 163: If one of my women had a son I’d know she’d been treacherous. I’d slash her [...] not to mention what I’d do to the real ponce-headed daddy.
1985		T. Murphy Conversations on a Homecoming (1986) 61: You are the worst of the worst type of a ponce of a modern fuckin’ gombeen man.
1995		B. James Detective is Dead (1996) 4: Some fucking old ponce wig will insist from the Bench that we [...] name the tipster.
1996		Tracks (Sydney) June 53/2: The French, however, were loving it, probably praying nightly for ball-high ponce-surf.
2000		Guardian Guide 22–28 Jan. 28: You sneery I-Tie Frappaccino poncebag o’shite.