What does じゃんけん mean?
じゃんけん is a Japanese noun meaning “rock-scissors-paper game” in English. It is written as じゃんけん in hiragana, and janken in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
「じゃんけんね」「ぐー」「ちょ・・パー」「後出しかよ！」
"Rock-paper-scissors, OK?" "Rock." "Sciss... paper." "You cheated!"