Smash Ya Pasty is a slang word of North East England origin which means a man will have sex with a women very well,so much that the women will feel like there vagina has been literally smashed.
"man,i smashed her pasty so bad yesterday, she shit everywhere....kept shagging her though"
Last night I got lucky with this rough bird, went back to her place, and I got the hell outta there this morning before she got her smashedpasty our for seconds!