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The letters that come after a in the alphabet, like b, c, d, and so on. It's like the alphabet's version of a waiting line, but for people who smoke and don't care about rules.
B etc. means you're stuck waiting for your turn to smoke while someone else takes a long drag and doesn't share.
Why is it B etc. again? I just want my blunt.
B etc. is when you're the second person in line and the first person is still talking about their ex.