Green’s Dictionary of Slang

(orig. US) weak, ineffective, cowardly; also as a term of address.

1958		A. King Mine Enemy Grows Older (1959) 26: On my left, there lived an altogether ball-less wonder [...] He was called Wimpy.
1964		in Current Sl. (1967) I:4.
1975		J. Wambaugh Choirboys (1976) 230: Scuz threw a heavy arm around the wimpy little kid and hugged him.
1985		Tracks (Aus.) Jan. 21: Actually, the push through the crowd to the front bar was relatively incident free until some wimpy faggot pushed his groin into my hip as I waded past [Moore 1993].
1993		I. Welsh Trainspotting 209: That smarmy, wimpy cunt ay an officer [...] tryin tae talk tae ma Ma.
2002		(con. WWII) R. Mooney Father of the Man Prologue: Weaver, a scrawny kid from Rhode Island, weakest guy in the platoon [...] a bit lacy – if you know what I mean. We called him Wimpy.
2002		C. Stella Jimmy Bench-Press 56: He’s always trying to impress his wimpy rich friends.
2008		Sun. Times (S. Afr.) Mag. 27 Jan. 20: [cartoon] The men think I’m wimpy.
2012		R.A. Dickey Wherever I Wind Up 39: [I]n a school where smoke billows out of the bathroom and pregnant girls walk the hallways, you don’t want people thinking you are wimpy.
2021		L. McInerney Rules of Revelation 185: ‘Good luck finding a wimpy bitch to answer your phones for you’.