The term 'PIGS DO IT' can be broken down into two crossword solutions. The first solution is the word 'ROOT', which is a 4-letter word meaning to search for and dig up something with one's snout, as pigs often do. The second solution is the word 'GRUNT', which is a 5-letter word meaning to make a low, short sound, as pigs often do. Therefore, the term 'PIGS DO IT' can be interpreted as referring to the behavior of pigs, which includes rooting and grunting.