BTDT
BTDT definition by Slang.net
This page explains what the acronym "BTDT" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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BTDT is a quick way to say, "I've already experienced that." For example, if a friend asks if you want to go skydiving, you might reply, "BTDT. I'm keeping my feet on the ground for the foreseeable future. :)"
People typically use it when messaging, like in texts or messages online (e.g., Twitter DMs). For example, you may text your sister if she wants to eat at the restaurant down the street, and she replies, "BTDT. The food is OK, but not worth the price. You wanna come for, and I'll make something?"