knobbing

1. (UK, vulgar, slang) A session of penetrative sexual intercourse or the act of sexual penetration.Examples: "A knobbing is over before you know it and no harm done to the family but the shame of a dirty photograph can follow a husband into his grave ."; "Even when she was knobbing her fiancé's dad, she seemed to be more depressed than evil (which isn't surprising, as most of the knobbing took place in the gents' toilets in the Queen Vic)."; "Mark inwardly cringed at the term, especially as their 'knobbing' hadn't been too brilliant, anyway ."UKslangvulgar

2. (mining) The process of rough dressing stone; the act of cutting off projecting points from quarried stone.