an extra slice of gravy-soaked bread inside a turkey sandwich to make it extra moist. Monica on "Friends" invented it and Ross named it. Ross got really upset one time, when his boss ate his sandwich with a moistmaker.
Ross: Oh-oh really? Did you confuse it with your own turkey sandwich with a moistmaker?
by Dr. Heywood R. Floyd November 24, 2007
Amazing sandwich with a moist center from egg yolk or something else good... or gravy like the og moist maker from Friends (when Ross gets furious as his boss eats it)
Please girlfriend, make me a moist maker.
by Gufferyy January 07, 2011