The act of meandering or wandering around in an aimless manner that makes very little sense to everyone, including yourself. Derived from the movie Forrest Gump.
George: "Dude, where were you?"
Francis: "I went out over the bridge, then spied some filthy n'wah. After that I trekked further past Red Mountain and narrowly avoided an angry spriggan. After gumping around a bit more, I returned to my home."
Gumping refers to the process of being Donald Drumpf, whereby one nigs and gumps in mockery of human behavior; the process of blaming everything on anyone but oneself, even when one is blatantly guilty.