A secret "handshake" used by several shadowy societies in Britain concerned with the reestablishment of the Empire, especially in North America.
Person 1: Sir, would you like to exchange quids with me?
Person 2: I do not understand to what you are referring.
Person 1: Ah, my mistake.
Person 3: Excuse me, I could not help but overhear your proffer of trading quids with that fellow. I would be happy to trade quids with you.
Person 1: Ah well in that case, kind sir, please take this quid and also this secret parcel as a gesture of my good will.
Person 2: I do not understand to what you are referring.
Person 1: Ah, my mistake.
Person 3: Excuse me, I could not help but overhear your proffer of trading quids with that fellow. I would be happy to trade quids with you.
Person 1: Ah well in that case, kind sir, please take this quid and also this secret parcel as a gesture of my good will.
by Wide Mouth November 29, 2012
Get the Trading Quidsmug. Verb. To do something to someone else that they have already done to you. (From quid pro quo…. Something for something in Latin)
He went and wasted a bunch of money on smart blinds for the house. I should quid him and buy that nice pair of shoes I’ve been looking at
by Carpool Dexter April 19, 2024
Get the Quidmug. 
this for that; tit for tat (obsolete, but still used by older people); "you scratch my back and I'll scratch yours"; usually used in legal exchanges with attorneys each giving something to settle a case.
The "quid pro quo" in the divorce was that the wife would get the house and the husband would get the cottage on the lake.
by Ellery Queen II November 29, 2019
Get the quid pro quomug. 
Innit, some ting dem bi'ish folk say mate which means a dollar wheyyy, a true geeza say it on da dayly mate, Imma go to da pub and get some fish'n'chips mate wheyyy.
Ser William Dinkelschoppel: "Hello my kind sir, would you kindly get me a plate of fish'n'chips please."
Bartender Stewart-Danielson of House Richstern: "That I shall do for, the paultry sum of, 3 Quid, please."
Bartender Stewart-Danielson of House Richstern: "That I shall do for, the paultry sum of, 3 Quid, please."
by Quid, British, mandem. November 15, 2022
Get the Quidmug. Where a service is provided on its face pro bono (without payment), but the length of time spent and the complexity of the service means it is likely there is a quid pro quo settlement of the debt occurring somewhere quietly in the background.
The lawyers were acting for the defendant pro bono, but people suspected that it was actually a quid pro bono arrangement as there was no way the lawyer would work for that guilty defendant for free for so long.
by Mezmerina December 18, 2023
Get the Quid pro bonomug.