The term 'HIGH GUY' can be broken down into three crossword solutions: STONER (6 letters), ALTO (4 letters), and MALEALTO (8 letters). A stoner is someone who smokes marijuana, which is a drug that can cause a person to feel HIGH. An ALTO is a type of singing voice that is lower than soprano but higher than tenor. Malealto is a combination of the words male and ALTO, and it refers to a male singer with an ALTO singing voice.