でこ 凸ピン LinksSentence search for 凸ピンSentence search for でこピンSentence search for 凸ぴんSentence search for でこぴんSentence search for デコピンKanji details for 凸Edit in JMdict Noun1. finger flick to the foreheadUsually written using kana aloneOther forms凸ぴん 【でこぴん】、デコピン Discussions Log in to talk about this word.