Green’s Dictionary of Slang

1. to squash, to squeeze; thus squished adj.

1859, 1860		Hotten Dict. of Modern Sl. etc.
1934		C.S. Johnson Shadow of the Plantation (con. late 19C) 22: She was too mean ter let you go to the well and git a drink of water, and God come long and ‘squshed’ her head open.
1958		Willans & Searle Complete Molesworth (1985) 271: You hav a face like a squished tomato.
1989		R. Dahl Rhyme Stew (1990) 76: His nails, his teeth, his bones, his skin / Were being squished and squashed so thin.
1992		D. Jarman letter 25 Mar. Smiling in Slow Motion (2000) 103: HB so furious he squished the bun in my face.

2. to destroy, to spoil.

1991		F. Mac Anna Last of the High Kings 43: He hoped that Buster had been squished by a truck.
1999		Indep. Rev. 28 June 10: It was such a disaster that it almost squished the careers of all involved.