Entry 1 sense Webster, 1913 peeing /(pē"ĭng)/ · pee·ing · IPA /pˈiːɪŋ/ 01 n. Urination; -- an informal term; as, he doesn't like peeing out of doors. 1. Urination; -- an informal term; as, he doesn't like peeing out of doors.[Inform.] Syn. pee, pissing, urinating.