wet (oneself)
1. Literally, to urinate while wearing one's clothing. I had to go to the bathroom so bad that I'd nearly wet myself by the time I made it home. Sarah has just finished potty training, but she still wets herself from time to time.
2. To laugh hysterically or uncontrollably. (Usually used in the continuous tense.) Raj's new boyfriend is hilarious, he had us wetting ourselves through the whole lunch!
3. To be extremely excited or giddy. (Usually used in the continuous tense.) Abigail and I were nearly wetting ourselves with excitement for the concert to start!