A goof is an embarrassing or silly mistake that someone makes.
You might hear people use "goof" when they're talking about something silly that happened to them. For example, if you spill coffee all over your shirt before a big meeting, that's a goof! People also use it when they mean to say something like "mistake" but want to emphasize how silly or embarrassing it is. It's a casual way of talking about things that happen and make us laugh (or cringe).
A mistake or error.
Example: I made a goof in that last calculation.
To make a mistake.
Example: It's my fault. I goofed.
