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1. In a thick, semi-liquid state. If you like soft, gooey chocolate chip cookies, my mom makes the best.
2. Overly sentimental. I don't need some sappy card and a box of chocolates on Valentine's Day—I hate all that gooey stuff.
3. A play on GUI, the initialism for "graphical user interface," which allows one to interact with a computer via a mouse or touchscreen. The tech guy thinks it's an issue with my gooey or something—I have no idea what he's talking about.
n. a graphical user interface. (see also WIMP.) Some of the older programs that lack a gooey require a lot less memory to run.