So asked Michael Rank in the comments section to this post:
"Triple topolectal reprimand" (5/29/16)
That's a very good question.
It's a common expression among Wuhan speakers, a pet phrase for men and women alike, almost as though it were a sort of mantra or dharani. If you ask them what it means, they will probably tell you that they themselves don't know, in which case you might get the impression that it's a modal or expletive without specific semantic content.