調子者
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Meanings
1
person who gets carried away easily; person easily elated by praise; person who readily chimes in
Describes someone who quickly becomes excited, overconfident, or overly agreeable when praised or caught up in a mood. Often used in a mildly critical or teasing way. The prefixed form お調子者 is also common.
See also: お調子者
He's the type who gets carried away easily, so if you praise him he immediately gets a big head.
That guy who gets carried away easily starts goofing off as soon as everyone laughs.