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..."
v. Glomp is a way of hugging someone hard sometimes nearly crushing them. The act of hugging violently/ pouncing on a unsuspecting victim. This turn is often used in anime and manga becuase most people don't actually attack people when giving hugs....most people. Look up Glomp.
I knew the glomping was coming when I saw her running toward me.