Teaing is like Tea bagging.
rather than the testicles being singularly placed in the mouth of a sleeping or passed out friend, it is an all out urination whilst the cock and balls are withing their mouth.
Roger passed out so tead him. Teaing is fun!
To piss on someone when you know you've drank plenty of unpure fluids e.g. soda, coffee, tea etc
Open your mouth Mei I'm going to be teaing in your face.