A figure of speech that implies that one laughed so hard that they lost bowel control. Not to be taken literally.
Oh, you came so close! "Peed Myself" could almost be considered slang. But did you define it? No! You just took the opportunity to declare how funny you think you are. Yes, you like fig netwons, you've made that abundently fucking clear, but seiously...Look at my above definition. It tells us what the term means elegantly and concisely, without ever mentioning how clever I am or how cute my girlfriend or child is or what my favorite food it. If you are too fucking stupid to understand the format of this website than I think you have no business on the internet.