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thin dinkies is commonly used as a name for a group chat.
there are usually three people in the chat and they never use it.

the first day of having it they text for around the whole day, before they stop using it immediately.

it can also be used as a soft insult. you can say your friend has a thin dinkie, and they will immediate cry
"oh boy, my thin dinkies are so old now, we haven't used them since 2016"
"oh my god, same!"
via giphy
by thindinkinator February 20, 2018
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