tisse

Etymology
Euphemistic modification of the vulgar verb.

Verb

 * 1) pee, piddle

Verb

 * 1)  to pee, have a pee
 * 2)  to wee, have a wee

Usage notes
Regarded as a euphemistic form of, but it is less formal than.

Synonyms

 * (more informal)
 * (formal)