Call me back
Hey, I have a question 4 u. CMB when you get this.
This page explains what the acronym "CMB" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Someone who wants to talk to you ASAP may use CMB to mean "call me back." You'll most often receive this acronym in text messages, prompting you to call the texter back.
Many times, talking via phone is more efficient than talking via text. The person who sent you CMB likely thinks this is one of those times - so you really should just call them back when you have a sec.