When someone can't wait to find a worthy girlfriend of boyfriend so instead, so they can fill the void quickly, they take whoever is available. This process is known as "taking the drive-thru."
Sister is tired of dating losers but she's not willing to wait around to meet someone worthy. She has to have a relationship at all times. She was doing good saying she was going to wait to meet someone who was right for her, but then she got lonely and this guy who liked her kept calling her. She ended up taking the drive-thru and now he's her boyfriend. She doesn't even really like him but she couldn't wait and took the Mc Ds Relationship route again.