('informal') She lost the tickets? How 'classic'. [=it is not surprising that she lost the tickets; she often loses things]
Their latest album is 'destined to become a classic'. [=it is very good and will still be admired many years from now]
a radio station that plays 'classic' rock [=rock music from the past that is still popular]
(..) MIKE: I want to live in the past. JANITOR: I'll bet you wish you had it to do all over again. Hello?! NED: It's a classic transformation story. MIKE: Spirit guide? You and me, we're in this together. It's your turn now. Traveling. (..)2009 17 Again
(..) Would you stop staring at me? - It's freaking me out. - It's freaking me out! I'm pubescent! Okay. So, uh... ...it's a classic transformation story. It appears in the literature time and time again. Were you at any point shot by a gamma ray? - No. (..)2009 17 Again