means c*nt and twat
the link below is the earliest it was shown for me (in b3tasearch)
hooker1uk stop being such a twunt,
sorry to be a twunt but, ris
Origin: http://b3ta.com/board/5652
Its first widely-known usage was in Chris Morris's TV show "Jam" (2000).
"When roped to concrete, and noose your bauble for car-powered head divorce, then find your scheme all twunted by a Honda."