离水小螃蟹
[lí shuĭ xiăo páng xiè]
'Little Crab Out of Water'. Crabs typically live in water or at least are very comfortable in it, so a 'little crab out of water' can mean feeling out of place or struggling in a situation outside one's element. This user may use humor or self-deprecation to say they find themselves somewhere or doing something they are unfamiliar with or not quite suited for.