A cock (vulg.). Commonly a derogatory term for someone of limited appeal, talent, or charm. Also -
Descriptive of the state that young men occasionally find themselves in after contracting thrush, whereby they can be said to have
An Irritating Cock
(Louis Walsh is one of the panel on Simon Cowell's UK version of 'The X Factor', despite being a talentless wanker.)
Did you see Louis Walsh on X Factor?! He's a cock. Or, post-Amsterdam excursion, a young man was heard to say "I wish I'd never gone to De Wallen, I've got a right Louis Walsh now"