尿 can be said several ways in english...The formal word is "urine" (or as a verb "urinate") Pee and piss are the common terms. Pee and piss can be used as nouns or verbs. The phrase "尿裤子" is most commonly said "wet [his or her] pants". Ex. That boy drank to much Coca Cola so he wet his pants. OR Jenny always wets her pants.You could also say "pissed his/her pants"