The term 'Fat Mouth' is a colloquialism used to describe someone who talks too much. The crossword solutions for this term are 'TRAP' (4 letters), 'YAK' (3 letters), and 'YAP' (3 letters). TRAP is a verb meaning to capture or ensnare, while YAK and YAP are both onomatopoeic words used to describe loud, incessant talking. Therefore, the crossword solutions for 'Fat Mouth' can be interpreted as capturing someone who talks too much, or describing the sound of someone who talks too much.