YBM stands for "You Before Me." It is not part of ritual and has no real significance other than it is simply a signature greeting used when signing off on emails/notes, like "Sincerely." Not all chapters use it and I would venture to say that most do not.
This is a greeting that should be used among members who know each other quite well, not advisors, alumnae chapter correspondence, or those you'd consider acquaintances.
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Kappa Alpha Theta-Life Loyal Member
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