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A sammi is someone who calls a sandwich a 'sammie' and thinks it makes them sound cool. They probably also call their junk 'herbert' and think it's adorable.
DM: 'I'm making my sammie now, and my herbert is happy.'
Text: 'I wish I was a sammie, I'd eat it and not care.'
Post: 'Sammie is just a fancy word for a sandwich. Herbert is a fancy word for my junk.'