Long Term Jumper - When a guy changes his clothes when in a relationship to socially(not for work) rock filthy, boring, plain coloured crew and V-neck: lambs wool, cashmere or cotton jumpers/sweaters to appease the gf/wife. Often paired with Chino's, pastel coloured shirts, boat shoes, scarfs and other generic clothing that lets down man-kind.
'Fiiiiiler, what on earth is that dirty little LTJ doing on you?'
'Have you seen the LTJ on Bino, he is proper under thumb!'
'Look at the LTJ on you, the mrs taken you shopping to GAP has she Wish?