The term 'HOW GROSS!' is an expression of disgust or revulsion. It can be used to express one's feelings about something that is considered unpleasant, unappealing, or distasteful. The crossword solutions for this term are YECCH (5 letters), YUK (3 letters), UGH (3 letters), and EWWW (4 letters). These words are all exclamations of disgust and are often used interchangeably with the phrase 'HOW GROSS!' to express a feeling of revulsion.