KAPOW! COUSIN is a phrase that is often used to express excitement or surprise. It is derived from the sound effects used in comic books and cartoons to indicate an explosion or a punch. The two words in the phrase, 'Kapow!' and 'COUSIN, ' are both onomatopoeias, which are words that imitate sounds. The crossword solutions for this phrase are WHAM (4 letters) and BAM (3 letters). WHAM and BAM are also onomatopoeias that are used to indicate a loud noise or impact. Together, these four words create a phrase that is used to express excitement or surprise.