Top Definition
Any type of chalky, hardening compound used in building construction. Products such as drywall joint compound, floor leveling compound, etc.
Customer: How long will it take to finish the drywall?
Drywall contractor: About a week. We need to hang it, then apply the first coat of magumpus. I need to come back a couple days later and apply another coat of magumpus. Then sand the magumpus and paint the walls.

Customer: What are you gonna do about the floor? It slopes down toward the center of the room.
Contractor: Well, I need to mix up some magumpus, pour it on the floor to make it level, then put a layer of plywood over the floor.

by Jeff 46902 November 29, 2007

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