The characters combine to create the literal meaning “to hug a big thigh.” The “big thigh” serves as a powerful metaphor for an influential person, a strong company, or a powerful backer. By “hugging” it, one seeks to gain stability and piggyback on their success.
The concept of 抱大腿 is deeply embedded in the social dynamics of China, where 关系 (guānxi), or personal connections, can be crucial for success. While building relationships is a universal human activity, 抱大腿 describes a specific, often looked-down-upon, strategy within this system.
抱大腿 is a common, informal slang term used in a variety of modern contexts. Its connotation is usually negative and critical, but it can also be used in a self-deprecating or humorous way.