Doing a Theresa 

Trying to move from a good position to a best position and ending up worse off ; cf the old adage "The Best is the Enemy of the Good"

Theresa May is the UK Prime Minister whose Conservative Party had a a working majority in the UK Parliament . She tried to increase the size of that majority by calling an election on 8th June 2017. Although the largely Conservative Party supporting UK Press predicted a landslide victory she in fact ended up losing her overall majority the major oppostiion Party (Labour ) having gained 30 more seats than they held before the election. Theresa May has now lost her overall majority and is in a greatly weakened political position. Whence the expression "Doing a Theresa".

Doing a Theresa by Arabella pinkerton June 13, 2017

Doing a Theresa 

The sexual practice of fucking the police up the ass while taking a dump on the prison system.

The Prime minister of England is "Doing a Theresa" again.

Doing a Theresa by D. Grey March 29, 2019

Doing a Theresa 

When you had every advantage in a situation, but still manage to get FUBAR.

Announcer 1 “John was had an amazing hand in poker, with a ace high straight flush”

Announcer 2 “I know, why the hell did he fold to a guy with a uno card and a sweetener packet”

Announcer 3 “ In all my years of being a announcer, never one have I seen someone doing a Theresa this hard”

Doing a Theresa by Justin Heras March 29, 2019