Definition from Wiktionary, the free dictionary
Alternative forms 
The term originated from WWI, indicating a soldier missing both his arms and legs, who needed to be literally carried around in a litter or "basket." Today it indicates a state of helplessness similar to the metaphoric removal of the appendages.
- (idiomatic, slang, potentially offensive) One made powerless or ineffective, as by nerves, panic or stress.
- She was a complete basket case the morning of her wedding.
- (idiomatic) A country in a difficult economic or financial situation.
- This country is a financial basket case, a country so broke that it should be a perfect warning to lenders.
- Some countries are breadbaskets, others basket cases.
- (one made powerless or ineffective, as by nerves, panic or stress): emotional cripple
one made powerless or ineffective, as by nerves, panic or stress