有来头

有来头:

Literally means:

have strong backing; with an unusual background

Actually means:

When used to describe a person, this phrase means that he or she has strong backing or with an unusual background. It connotes that he or she should not be trifled with or displeased.

When used to describe something, this phrase means that the occurrence of something has good or sound reasons.

指人的来历不一般，有靠山、有背景。含有不可小看或得罪的意思。

指事情有一定的缘故。