What does おしっこ mean?
おしっこ is a Japanese noun meaning “wee-wee; pee-pee; number one” in English. It is written as おしっこ in hiragana, and oshikko in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
便座におしっこしちゃったら、ちゃんと拭くのよ！
If you piss on the toilet seat, wipe it off!