What does the phrase, "sucking on the digital teat" mean?

Sucking on the digital teat, or digital teat is a term first coined by Mark N Hopgood in 2005 to describe some people's actions regarding devices such as smartphones and tablets.

Mark, a London based music producer and artist with Projektor Digital, explained ..

It's like an addiction. Just like a baby might spend hours suckling on their mum, a Candy crusher might spend hours sucking on their digital teat.

The phrase and hashtag #digitalteat, #dt or just #teat is rising in popularity as a way of describing someone who is taking comfort in the digital milk provided by their device.

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Thanks to https://www.pexels.com/@beatadudova

for the image.