The term 'COUNT ME IN!' is an expression of enthusiasm and willingness to participate in something. The crossword solutions YES (3 letters), SODOI (5 letters), IMGAME (6 letters), ILOVETO (7 letters), IMFORIT (7 letters), IMTHERE (7 letters), and IWANTTO (7 letters) all express a similar sentiment. YES is a simple affirmative answer, while SODOI is an acronym for 'Sign On, Do Or Die In'. IMGAME, ILOVETO, IMFORIT, IMTHERE, and IWANTTO are all variations on the phrase 'I'm in!', expressing enthusiasm and willingness to join in.