Verb - When an individual in the room announces that he ( Or she ) has gas, a third party relieves themself of their own built up flatulence. Thus directing the blame to the individual that announced having gas.
Chris: "That tuna casserol was delicious, but I think Its giving me trouble down south."
Tom: *Procedes to let loose a SBD
Travis: "OH WTF CHRIS YOU FARTED DIDNT YOU!"
Chris: "WTF noo?"
Tom: *Snickers* "Yeah that was me, I dropped a ventrilifart."