When you fuck off back to your parents at the earliest sign off hardship, particularly when it may be illegal to do so.
"Did you hear Simon had a drunken argument with his wife in the bar?"
"He's such a twat, did he do a Cummings?"

"yeah, I think so"
by TheClnl May 26, 2020
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To blatantly break rules, the law, or social norms out of sense of arrogance, superiority and entitlement, especially when you get away with it or face only tokenistic punishment, thus provoking disgust, anger and resentment amongst the wider public who are expected to abide by those same rules and punished if they don’t. Named in honour of Dominic Cummings, one-time right-hand man to British PM Boris Johnson, who during the first covid lockdown drove across the country from London to Durham to his parents, and made various trips in the local area, later stating these were necessary to ‘test his eyesight’. He kept his job.
Bob: I got pulled over for speeding last night, but the cop let me off with just a stern word after I told him I’m close friends with the police chief.
Tod: wow! Sounds like you really did a Cummings there.

Covid marshall: you’re out in public in lockdown without a valid reason and are therefore being given a £100 fine.
Average ordinary chump: ah man, if I was rich and well-connected I could have done a Cummings and gotten away with this.

Wife: I caught you red-handed in bed with another woman.
Husband: but I had to see another woman in a state of undress in order to test my eyesight.
Wife: don’t try and do a Cummings with me!
by A jolly fine fellow January 10, 2021
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Doing a Cummings is breaking lockdown guidance because I fancy a trip to see my family for the it will benefit my son's mental health.
by Angry mamma May 27, 2020
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The act of breaking instructions, rules or laws by the very person or persons who developed or introduced said instructions, rules or laws.

Believed to be derived from a number of parliamentarians and other close associates who did not strictly follow various rules imposed on the population of the UK during the Covid-19 crisis of 2020.
Despite telling his children to behave whilst they attended a friends BBQ, Simon was seen to do a Cummings by getting blind drunk and throwing up all over the Greek Salad.

After telling the family that they must all be saving for the family holiday, Wendy promptly did a Cummings when she went and bought herself an expensive new handbag.
by AlexY1969 May 29, 2020
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