A basement is a place you keep your hostag- I mean your things you don't want in your house... it's important that there's stairs down to your basement so when the hostag- I mean things you don't want in your house are trying to escape you can break their ankles so they can't run. And it's also important to have a baseball bat.
The act of sitting in a basement and doing nothing. Most commonly this is found in a group of friends who are boring and have nothing else to do, or are too lazy to get off their asses and make something of their lives. Basementing is the opposite of adventure.
not just a basement, but a house that everybody refers to as "the basement." The basementin the house is the best part of the house where everybody congregates and chills.