Sounds like a 'dip'. It's a quick lowering of the pitch, then immediately returning to pitch.
I was trying to be less onomotopeic.jbtsax said:We call that a "Deeoowee" out here in Utah, not to be confused with the "Dow" (curved line going down) or the "Dwee" (curved line going up). A short heavy note of course, is a "Dumb" (just kidding).
John