IDI
IDI definition by Slang.net
This page explains what the acronym "IDI" 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 is fairly certain an event won't happen might use IDI (I doubt it) to say so. You're most likely to encounter this acronym in text or chat messages, sent by disbelieving friends, family members, or co-workers.
For example, if you ask an American football fan whether the Chicago Bears will win the Super Bowl this year, they might respond with "IDI, they're not good." Or, if you ask a realtor whether home prices will fall this year, they may respond with "IDI, home prices rarely go down."