The term 'Sighter of Pink Elephants' is a phrase used to describe someone who has been drinking heavily and is experiencing hallucinations. The crossword solutions for this term are 'WINO' (4 letters) and 'SOT' (3 letters). WINO is a slang term for an alcoholic, while SOT is a derogatory term for someone who is habitually drunk. Both terms refer to someone who has been drinking heavily and is likely to experience hallucinations.