MB
/em bee/interjection · initialism
Meaning
In texting, group chats, gaming and social media, MB means “my bad”—a brief way to admit a mistake, accept responsibility or offer a casual apology. It usually refers to something minor, such as forgetting to reply, misreading a message or sending the wrong link.[2][3]
- 1. A short apology for a small mistake: MB, I sent the wrong address.
- 2. An admission of fault or responsibility, often with a relaxed or playful tone: MB, that loss was on me.
- 3. In other contexts, MB can mean something unrelated, such as “megabyte” or occasionally “maybe”; the surrounding message determines the meaning.
Examples
“MB, I read the schedule wrong.”
“Forgot to attach the file—MB 😭”
“MB, that last play was on me.”
“You said Tuesday? MB, I thought you meant Thursday.”
“MB lol, wrong group chat”
Origin and spread
MB is an initialism formed from the first letters of “my bad.” Internet-language references record mb as an online abbreviation for “my bad,” and slang references describe it as a casual way to admit a mistake or say sorry. The exact date and person responsible for shortening the phrase are not established.
How to use it
MB is best for casual texts, DMs, gaming chats and quick replies. Lowercase mb often feels even more relaxed. Because it is brief, it can sound dismissive when the mistake is serious or the other person expects a fuller apology; in professional or sensitive situations, write “I’m sorry” or “my mistake” instead. Do not assume MB means “my bad” in technical contexts, where it commonly means “megabyte.”
