GUAC stands for Graph for Understanding Artifact Composition. GUAC aggregates software security metadata into a high fidelity graph database.
A food analogy would be like: a bowl of guacamole is consisted of avocado, tomato, onion, etc. and further relationships can be made to where those ingredients come from, and what farms and distributors they are from. This analogy (and the acronym) is visualized through the logo with techy element to it.