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L&M is a smug way to sign off an e-mail like you’re sending a love letter to your ex while still being mad at them. It comes from a message board where people talked about Brian Wilson’s song, which is about as good as being stuck in a traffic jam on a Tuesday.
Hey bro, I’m gonna sign off with L&M because I feel fancy and you don’t.
L&M, bro. You’re a disappointment, but I still like you.
L&M, because I can’t think of anything else and I’m too lazy to type ‘Love and Mercy’.