This term refers to a man "gaining" an inch to his dick by having done somethingextremely badass/manly, thus becoming even more manly. Men can wear these accomplishments as a medal and brag about them at later dates.
Dude #1: "Man yesterday was crazy! I definitely gained an inch."
Dude #2: "What did you do to earn that accomplishment?"
Dude #1: "I grew a beard, threw on my plaid shirt and bibs, and went out to the forest and chopped down trees to make myself a log cabin."
Dude #2: "Damn!"
To overkill a joke. When a joke is told by one person and thensomeone else keeps piggybacking and adding on to that joke until, at last, it has no humor left in it.
Man, we were having a couple of beers the other night and this chick walked in with those UGG boots. We all started laughing at her, but Jimmy kep going and going and going. I felt kinda bad, but he should've known he gained it.