A euphamism, mainly used in the South West of England to indicate the physical act of love making.
To make love; To smash pasty's.

"I smashed her pasty. Looked like a punched lasagne afterwards"
"I took 'im 'ome an aftur drinkin Frosty Jacks an watchin Countdewn we smashed pasty's"
by Caenfayre September 25, 2017
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