2008 is simply said "two thousand and eight" in English. This way of saying the year is derived from the way we typically write and say numbers in English. Here are some examples:

"I was born in 2008."

"The Beijing Olympics took place in 2008."

"The financial crisis of 2008 hit many countries around the world."

In each of these examples, "2008" is said as "two thousand and eight" in English.