Feigned or deliberately artificial seriousness, often for satirical purposes

This sounds like someone pretending to be solemn or serious, when it is only an act. They don't really feel serious or pious. Also if they are mocking, they might be making fun or making light of something serious or solemn. They may be laughing or joking about something they should be serious about.

mock solemnity= pretending to be serious

I requested you as a friend over 2 months ago, and never was accepted. I figured you was away for long time, or something. Well, I hope you add me this time.