The questionably traditional practice of being forced to run around a lawn, quad or yard with one's trousers down one's ankles, as a result of being 'whitewashed' in a bar game, i.e. beaten all points to nil. Almost exclusively the reserve of public schoolboys and Oxbridge undergraduates.
Little Jimmy lost 11-0 to Tarquin at table football and so was trousered; much merriment ensued at the sight of Jimmy feebly waddling round the quad, and Tarquin and his buddies had a jolly good laugh about the trousering.
by Tonemeister General October 18, 2010