A relationship between two people where one person agrees to make the other person's problems their own. More than often the agreement turns out to be one-sided. This includes lending money, giving rides, emotional support, listening to the other complain or just simply listening to and dealing with the other person's constant bullshit. In actuality, an official agreement was never made to do any of this. Rather a process takes place over time where one party is slowly manipulated into all of the above mentioned acts. Most of the time these relationships eventually end with the main supporter having had enough of the user's ways. However, there are occasionally more extreme cases where the relationship goes on for years, sometimes until death does them part, due to the supporter's own extreme stupidity. In some cases, the situation is so bad that the one party might actually be entitled to claim a dependant when doing their taxes.
"Hey, I know it's midnight and you're in the middle of drinking and having fun but would you stop what you're doing and drive me thirty minutes away to my house? Reason being, I left the cat locked in the bedroom and I need to let her out. Thanks, buddy. I really value our friendship".