The poem moves like a dream, jumping from one odd image to the next without explaining the links. It opens with a plain action: the speaker takes a barrel of oysters and watches how they "cry." That strange, tender detail sets a tone of quiet sadness. Then the scene shifts abruptly to a sold moon and to men hanged because of a dog fouling a bed. These lines sound like fragments of rumor or folklore, and what they share is a sense of absurd, disproportionate loss and punishment.
The final lines pull it back to something personal. The speaker dreams all night that his wife made him ill, which suggests the earlier images may be pieces of that dream, or of a troubled mind. The poem doesn't say why he feels this way. Judging by the imagery, the mood is uneasy and nightmarish, with guilt, blame, and helplessness drifting under the surface. The title's odd, invented-sounding word adds to the feeling that logic has slipped.