A speaker watches someone dance, and the movement is so lively that his books tumble off their shelves or table. He takes this as a sign of how things stand in his life: a bit disordered, perhaps, but loosened up. The title, "Good-for-nothing," suggests he may see himself as useless or idle, yet the poem doesn't sound ashamed. It sounds surprised.
There's still some nervousness. He admits he fears "a tall woman without shoes," a funny, slightly awestruck image of someone barefoot, unguarded and powerful. Alone, he can't quite believe his "new light heart," as if the happiness only feels real when she's near. The last lines are strange and open: his mouth is "like a pot," and the wind makes noise. Judging by the imagery, he may feel hollow or emptied of words, simply sounding with the world around him. The mood is playful, tender, and a little dazed, like someone caught off guard by joy.