What kind of skill is it to live off your parents? Just leaning on someone else day in and day out.
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history
From Su Shi's 《东坡志林》: 吾辈不肖，方傍人门户，何暇争闲气耶？('We unworthy ones are merely living under others' doors — where do we find the leisure to quarrel?'). Originally about lesser scholars depending on wealthy patrons; now any kind of dependent existence.
memory
Parse as 傍 (lean against) + 人 (someone else's) + 门户 (door) — to literally lean against another person's doorway. The image is of someone with no door of their own.
