The point at the end of a party when you have a deep conversation with a person/people.

The name comes from the meaningful conversations usually held in the kitchen by the sink after a party has taken place. Hence the name Deep Sink, it can be used for any end of party meaningful conversation or even just a deep conversation when you and a person/people are more than a bit out of it.
" Me, Jamie and Maisie had a deep sink last night I really feel closer to them now. I may have shared too much."
by Portland September 15, 2017
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