Crap, naff, kitsch, bad quality, disappointing, in poor taste. Presumably derived from the tutting noise that is so often the first reaction when we see something we disapprove of. Can be used of things, people, forms of behaviour, styles of dress, music. When used by a male of other males can have homophobic implications (see example). British Punjabi slang?
'The three a us spoke in sync like we belonged to some tutty boy band, the kind who sing the chorus like it's some blonde American cheerleader routine.' Gautam Malkani, 'Londonstani', 2006, p.3.