Show off 在美语口语里面有两个用法。动词和名词。
Show off 炫耀(动词)
OMG Baijie! Look at Ryan! He's showing off his biceps again!
He can show off ALL he wants! I don't mind at all.
Do you like this dress?
Yeah! That dress looks so good on you! You should go out and show it off!
Show off (noun 名词) - 爱显摆的人，爱嘚瑟的人
Such a show off - 真是个爱显摆的人
I can't believe Rachel drove her Ferrari to school today! She is such a show off!
B: Of course I did! She is showing off her money all the time.