Noun
tail and fins
「学園の廊下で、濃厚なキスシーン・・・聞いたぞ聞いたぞ」「濃厚じゃなーい!話に尾ひれ付いてるって・・・」"A passionate kiss scene in a school corridor ... I've heard all about it!" "It wasn't passionate! That's an exaggeration..." embellishment (of a story, rumor, etc.); exaggeration
Also written 尾鰭【おひれ】、尾ヒレ【おひれ】