A fork of Rural Dictionary
Stereotypical home for the geek, nerd, fatbeard, loser, etc. The term implies that the individual still lives with one or both of his parents despite being a grown man. Reasons for still living at home may include a lack of drive and ambition, being unable to afford a place of his own due to spending all of his money on his hobbies (i.e. Star Trek figurines, comic books, and online role-playing games), or just plain being a mama's boy.
"Jeff is such a loser. He really needs to move out of his mom's basement and work on getting laid rather than spending every free minute playing World of Warcraft."
CSI: Mom's Basement is the term given to social media warriors who, (from the safety of mom's basement or some other hermetically sealed room), convict a public figure or high profile suspect based on fringe blogs, poorly sourced media, or personal biases.
So, you're just going to decide she's guilty based on a couple tweets and your own prejudices...what're you, CSI: Mom's Basement?
Worthless losers that live with their mother despite already growing up.
He should stop living in his mom basement while watching hardcore porn and smoking drugs while fapping all day.