Vocabulary
Form
to affect a stylish air; to try to look good; to show off
verb
vi
Example sentences
彼（かれ）は女の子（おんなのこ）の前（まえ）でかっこつけてるだけさ。
He's just showing off in front of the girls.
あいつは、女の子（おんなのこ）がいるとかっこつけたがるんだから。
He's a big show-off when girls are around.