The 23-year-old, who plays Jay Cartwright in the E4 comedy, praised the show's big-screen adventure for its "quality" depiction of the quintessentially British lads' holiday.
"It's real quality," he told The Sun. "Because we're making a movie, we really wanted to push the envelope.
"I think it's just going to be something Britain can be especially proud of because it's about that experience of a lads' holiday.
"For it to be on the big screen, and hopefully seen by people all over the world, that's something for us to say, 'This is what we do. This is how we do it. And we're proud of it'."
Buckley added that he had always seen The Inbetweeners as a loving, self-deprecating look at British youth - though perhaps one that was uncomfortably close to reality.
He said: "I always sort of felt like we were having a laugh at ourselves, having a laugh at being young and British.
"But then you get people say, 'I'm just like your character'. The worst ones are those who go, 'I'm just like Neil'. That's pretty bad, he doesn't know the difference between alive and dead."
A full-length trailer for The Inbetweeners Movie movie was released last week ahead of its August 19 launch.
> 'The Inbetweeners Movie' is "final piece of the jigsaw"
> 'The Inbetweeners Movie' trailer: 10 best bits
Watch the stars of The Inbetweeners discuss the movie with Digital Spy below: