いきる

to be livid; to try and come off as strong; to be cocky

Word type: 

Kanji: 

熱る

Standard: 

ちょうしにのる/いきがる

Standard kanji: 

調子に乗る/粋がる

Example: 

あいつ、最近、いきってんなあ。どうしたんやろ。
I wonder why he's been acting out lately.