SITD
SITD definition by Slang.net
This page explains what the acronym "SITD" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Are your friends talking about something you don't understand? If so, tell them you are SITD (still in the dark). Then, they'll be just as confused as you are, because they likely won't know what SITD stands for.
You can use SITD whenever you feel OOTL or unaware of essential context. For example, if your brother has been planning your mom's birthday party and has not shared any of the details, you can tell him you are "SITD re Mom's bday."