mro

"Mro" is an expression of lamentation, sympathy, awkwardness, or disappointment.

It functions in much the same way as "huh" or "hmm" (which mean, approximately, "I'm confused" and "I'm thinking, let's see," respectively). See examples.

Example 1.
Friend 1: Yeah, so Mr. Smith says I can't turn in those late homework assignments for credit anymore. So I'm gonna fail the class.
Friend 2: Mro. :-S

Example 2.
Friend 1: I came home early yesterday and the first thing I heard was my parents having sex.
Friend 2: Mro. :-S

Example 3.
Friend 1: John, what's that smell?
John: Um, I think it's that cheese I forgot to put away.
Friend 1: That's disgusting.
Friend 2: Mro. :-S

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