Dink's name comes from the combination of the initials D, I, N and K in English Double Income No Kids, which is the homonym of Dink. Double Income No Kids is sometimes written as Double Income No Kids.
Just from the literal meaning of this word, it means: double income, people who have no children so passively choose not to have children are not called dink.
A reasonable definition is a couple or individual who can have children but choose not to have children, and subjectively think that they are DINK, which is called DINK. The primary criteria for becoming a dink are: having fertility and choosing not to have children.
In addition to actively not having children, passively choosing not to have children may also be subjective or objective reasons. Secondly, it is very important to subjectively accept and recognize one's Dink identity and think that Dink is a way of life.
Strictly speaking, Dink can't have children. If he has the idea of having children, the person who repents is no longer Dink.