EXCLUSIVE

Rick Ross was like a loud fart in a quiet room when his ankle bracelet went off over the weekend at the White House.

Ross was there along with a bunch of other rappers -- Nicki Minaj, Busta Rhymes, J. Cole, Wale and DJ Khaled -- to support Obama's Brother's Keeper youth initiative, ironically to keep men of color out of trouble.

It was a serious and fancy affair ... enough to get Ross in a suit, which covered the ankle monitor he has to wear ... a condition of release in his kidnapping case.

Sources on scene tell TMZ Obama finished his speech when Ross' anklet ripped through the silence.

We're told Ross was even surprised ... the anklet's new and it randomly beeps.