na-adjective, noun
in high spirits; excited; energetic
Describes a person who is visibly enthusiastic, upbeat, and full of energy, often in a playful or lively context. Commonly used in casual conversation.
彼は今日ノリノリで、ずっと歌っている。
He's in high spirits today and has been singing the whole time.
ノリノリの音楽に合わせて
We danced to the upbeat music.
浮かれる implies being carried away by happiness, sometimes with a nuance of being frivolous or not serious, while ノリノリ is more about energetic excitement and enthusiasm.
陽気 describes a cheerful, sunny disposition or atmosphere, whereas ノリノリ emphasizes a temporary state of high energy and excitement.
Reduplication of 乗り (nori), the continuative form of 乗る (noru, 'to ride; to get on'), suggesting being 'on a roll' or 'riding a wave' of excitement. The exact derivation is uncertain, but the word is clearly sound-symbolic and colloquial.