Tā bèi lín chéng le luòtāngjī, quánshēn shī tòu le.
He got soaked in the rain and was drenched to the bone.
Tips
memory
落 (to fall into) + 汤 (soup/hot water) + 鸡 (chicken) - a chicken that fell into a pot of soup. Picture a bedraggled wet chicken and you'll never forget this one.
usage
落汤鸡 is a vivid colloquial metaphor for a person who is completely soaked by rain or water. It can also convey a sense of embarrassment or pathetic condition.