The phrase "absolute masterpiece" means something is considered the best and most exceptional work of art or creation. It is recognized as a remarkable achievement that displays great skill, talent, and creativity. Full definition
Ones I completely agree with: «Lord of the Rings 3» was the best film of 2003 (yes, I said it), «Silence of the Lambs» (absolute masterpiece right there; can't believe Siskel didn't like it), «Forrest Gump», «The Godfather» (embarrassingly, I haven't seen either of the others; don't shoot me). (incontention.com)
Another WSC newby, Mari of Nutty Tart has rocketed in with an absolute masterpiece. (tinandthyme.uk)
Both of Aguero's goals were sublime, with his second being something that would be worth hanging up in a gallery: an absolute masterpiece. (caughtoffside.com)