The term 'Speak Like Daffy Duck' can be summarized by the crossword solution 'LISP'. LISP stands for 'List Processing Language', and is a computer programming language that was developed in the late 1950s. It is a high-level language, meaning it is designed to be easier for humans to read and write than other programming languages. LISP is used for artificial intelligence applications, such as natural language processing and machine learning.