抱住门唱忐忑

This quirky and imaginative username translates to 'Holding the door singing with anxiety/fear'. Possibly referencing Gai Zhou's famous anxiousness-filled pop song 'Tanzi' (an old Beijing game which means uneasy and restlessness), the phrase humorously combines the physical act of clinging onto safety with emotional expressions through musical outlets, suggesting coping mechanisms during tense times or just playing around lightheartedly.