The term 'Animal House House' is a combination of two crossword solutions: FRAT (4 letters) and DELTA (5 letters). FRAT is an abbreviation for fraternity, which is a social organization for male students at a college or university. DELTA is a Greek letter that is often used to represent the word 'CHANGE' or 'DIFFERENCE'. It is also the name of a popular fraternity at many universities. Animal House House is a reference to the 1978 comedy film 'Animal House', which follows the antics of a fraternity called DELTA Tau Chi.