'American Idol' Contestant -- Sikh Org. Thrilled Over THE TURBANATOR!

It was judgement day for a singer dubbed "The Turbanator" on "American Idol" Wednesday night ... and TMZ has learned the Sikh community is already hailing the guy as a MASSIVE success.

In case you missed it ... The Turbanator -- aka Gurpreet Singh Sarin -- won himself a ticket to Hollywood, while proudly sporting one of 50 turbans he claims to own. Dude says he color coordinates his turbans with his outfits.

TMZ spoke to a rep from The Sikh Coalition who tells us they're totally stoked for Sarin ... saying, "The Sikh American community is celebrating Gurpreet's achievement every step of the way."

The rep adds, "We are thrilled that the rest of America is going to learn more about our wonderful community."

Check out the video to see The Turbanator in action ...