Welsh slang - a part of The Alternative Dictionaries collection.
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to fuck / to knob / to shaft 
Ydy hi'n wir fod Seimon yn bwchio Dafydd? Is it true that Simon is shafting David?
lit. lamb's cock, meaning asshole or idiot
Usually aimed at men, especially ones who don't realise that they are 'coc oen'. Example: 'Iesu, mae o'n rel coc oen' = 'Jesus! he's a right idiot'