The term 'Yo, ___!' can be completed with a variety of words, all of which are slang terms for 'HELLO' or 'HI'. The crossword solutions include 'DUDE' (4 letters), 'SUP' (3 letters), 'HEY' (3 letters), 'Hiya' (4 letters), 'Hola' (4 letters), 'Psst' (4 letters), 'HELLO' (5 letters), 'Heyman' (6 letters), and 'Heyyou' (6 letters), as well as 'Whassup' (7 letters). These words are all informal greetings that are used to get someone's attention.