Combination of "trendy" and "indie": Used to describe formerly indie bands that have grown in popularity, usually (but not always) due to attention from British music mag NME. Examples include, but are not limited to, Bloc Party, Franz Ferdinand, The Killers, The Kaiser Chiefs, and The Arcade Fire.
Indie Snob: Man, I used to love Bloc Party, but they're so trindie now. Goddamn NME...
Trindie: popularindie bands such as The Shins, Bloc Party, Beck,Bright Eyes, Arcade Fire and many more, bands that are ok, but for the most part overrated.
Trindie Fan: Oh, mostly indie you know stuff like The Shins, Bloc Party, Beck, Bright Eyes, you?
Me: Ya I like mostly indie too, but mostly Elliott Smith, Neutral Milk Hotel, Animal Collective, the Robot Ate Me, Jamie T, Beirut, Mirah, not so much trindie music like you.
People who say they are Green Day's greatest fans but have only ever heard their 'American Idiot' album. They dye their hair black and wear eyeliner like the lead singer. And then they buy converses and class themselves as 'punks'. They really and truly suck and have to get a life.
Green Day Trendy 1: "Look at me, I'm wearing eyeliner!!!!!!!!!1"
Green Day Trendy 2: "I've only heard one of Green Day's songs...ah well, I'm still their biggest EVER fan coz I wear a hoodie with their name on!!!!!!1!11!"