Creator of the famed Game Boy and the not so highly thought of Virtual Boy. After the humiliation of the VB, he leftNintendo and worked with Bandai to create the Wonderswan. Sadly, he soon later died in 1997 from a car accident. He ended off poorly, but still left his mark on Nintendo and the world.
So, 'gumping it' is when someone is not quite retarded, but they're like just on that line.
"I need to confess a sin, Father. I worked at a grocery store in my teenage years, I won't get specific. There was this one girl-- are you familiar with the term 'gumping it' --so while it's an ethical conundrum, it's not fucking a retarded person if you were to sleep with 'em. This will come important later in the story..."