Super Swiftie Flavor Flav is so excited by Taylor Swift and Travis Kelce 's engagement, he's volunteering for a major wedding role.

The rapper tells TMZ ... he is so happy for Taylor and Travis following their engagement announcement yesterday -- lovingly calling the pop star his "girl" and the Kansas City Chiefs tight end his "boy."

Per FF, he always knew Taylor and Travis were "endgame" ... and offered up his services as officiant for whenever the pair decide to tie the knot. Gallery Launch Gallery

He adds ... "I can't wait for the wedding ... Let your boy, Flavor Flav, be the officiator. I would love to officiate the wedding. But, most of all, congratulations Taylor and Travis. May God bless y'all with the longest, prosperous marriage ever."

We're told Flav is not

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