http://en.wikipedia.org/wiki/American_Pie_%28song%29 The phrase was first coined in 1971 in a song. I think it refers to being in a drug induced state, where you have weird and strange illusions. But read the article.

Hello,I heard that there's a film named "American Pie",do you refer to it?

It's a movie. The film's title refers to a scene in the film in which the lead character is caught masturbating with a pie after previously being told that third base feels like "warm apple pie".

esto é com um polo(american pie) é bolo américano

American Pie is a 1999 teen comedy film written by Adam Herz. American Pie was the directorial film debut of brothers Paul and Chris Weitz. American Pie Presents: Band Camp is a 2005 direct-to-DVD, spin-off to the original American Pie trilogy. It is the first American Pie spin-off. It was directed by Steve Rash and written by Brad Riddell. It was released on DVD in the United Kingdom on October 31, 2005 and in the United States on December 26, 2005. Don McLean wrote the song "American Pie" in 1971. American Pie Pizzeria is located in Griffin, GA 31206.