RuPaul needs to take his own advice: Don't f**k it up!

We got our hands on the "Skin Wars" judge's outtakes from a promo shoot for the GSN show ... and let's just say, he really let the f-bombs fly.

While Ru was trying to promote online fan voting for the series' second season, he got majorly tongue tied ... and ended up dropping a whole lotta profanity instead.

Check out all the bloopers above and prepare yourselves for some major bleepage!

The body painting competition show comes back to GSN for Season Two on Wednesday, June 10 -- with Ru and body painting "icons" Craig Tracy and Robin Slonina returning as judges. The ever-stunning Rebecca Romijn also returns as host.

The "X-Men" alum recently underwent quite the transformation herself for the show, giving us flashbacks to her Mystique days by getting her nude body covered in paint for another new promo.

Check out her tiger transformation in the video below -- it's seriously impressive!

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