Green’s Dictionary of Slang

1. (US) used as excl. of disgust.

1905

S.F. Call 29 Mar. 5/2: The girl was promptly pronounced guilty and informed that she may be sent to an institution for the disciplining of incorrigibles. ‘Oh, gick!’ She exclaimed.

2. (US) viscous matter.

1959

W. Burroughs Naked Lunch (1966) 56: They are stained with some sticky, red brown gick.

3. (Irish) anything disgusting, esp. excrement; thus give someone the gick, to disgust.

1976		R. Carver Stories (1985) 201: I stopped cleaning the pool. It filled up with green gick.
1993		R. Doyle Paddy Clarke Ha Ha Ha 1: If I did a gick in me pants he’d kill me! [Ibid.] 5: Ah gick, said Kevin.
1996		E. O’Brien Down by the River n.p.: All you people with liberal tendencies is what’s destroying the country [...] it gives me the gick [BS].
2001		G. Coughlan Everyday Eng. and Sl. 🌐 Gick (n): shit.