Green’s Dictionary of Slang

(UK Und.) the essence, the ‘guts’; as in phr. bash the granny out of.

2004		N. ‘Razor’ Smith A Few Kind Words and a Loaded Gun 264: Once we picked up £500 a piece for bashing the granny out of a careless burglar who happened to burgle the home of a local villain.
2011		J.J. Connolly Viva La Madness 238: He smashes the granny out of product if he gets a chance, slaps it too much.