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When you undergo gastric bypass surgery, NEVER TRUST A FART — and Al Roker learned that lesson the hard way … at the White House.

Roker — who got his stomach stapled in March 2002 — shared his most embarrassing moment on “Dateline” last night, saying he was covering an event at 1600 Pennsylvania Ave a month after his operation … when he felt the urge to let one rip.

Roker said, “I probably went off and ate something I wasn’t supposed to. And as I’m walking to the press room, [I’m thinking] well, I gotta pass a little gas here. I’m walking by myself. Who’s gonna know? Only a little something extra came out. I pooped my pants.”

Roker said he beelined for the restroom to dump his underwear in the trash — and proceeded to go commando the rest of the day.

The lesson: watch what you eat. The other lesson: carry spare underpants.

via TMZ