IDMB
IDMB definition by Slang.net - The Slang Dictionary
This page explains what the acronym "IDMB" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Someone who sends you IDMB ("I'll do my best") plans to do their best at whatever task is set before them. This acronym is often sent by people who are unsure they can do what's been asked of them.
For example, if you ask a friend to pick you up at your house in a half-hour, but they are busy working, your friend may send back "IDMB." If your friend ends up being late, you should cut them some slack. After all, they did their best.