When two people who seem to have no skill in anything, have big feet, are awkwardly tall, and move their hands wildly play each other in a one on one game of basketball.
Damn fool... Caleb and Brett are hella gumpy out their on the court. They should be euthanized or something.
Can be used in different terms, but the true definition of gumpy is used to describe someone in a not necessarily offensive way, just kind of matter-a-factly.
Typically gumps are:
-tall
-gangly
-dorky
-goofy
-square -dumpy