How do you pronounce the o with the accent aigue

If it's anything like Spanish it just means that's where the accent goes despite rules to the contrary. No other pronunciation change. In Spanish the vowels are all pretty much pronounced the same accented or unaccented; I know Portuguese does some funny things, though.

I don't think there's any connection with subways; metro is usually an abbreviation for metropolitan [rail system] or something like that. I suspect it means measure here. Might be the whole thang is the measure of how much somebody misses the point.