The term "pee" is a common informal expression for urination, which refers to the process by which humans or animals eliminate waste products from their bodies in the form of liquid. This act typically involves the release of urine through the urethra, which is a tube that carries both urine and semen out of the body. The term "pee" can also be used to refer more broadly to any kind of liquid waste or byproduct, regardless of its origin.