Someone who does what is required of them. Usually this refers to duties in a group task or work environment. Best compared to some one who is a slacker.
John is someone who pulls their weight. He is never late, always on time. He does what ever is required of him.
1. A low amount of weight, usually lifted by a scrawny white male, and is made fun of by everyone who sees it.
2. A small male, made the butt of many jokes.
1. Tim felt pain after lifting his bitch weight.
2. Jake:"Look at that kid!"
John:"Yeah, he's so small! like bitch weight!"