Chiefly a British idiom. When something "takes the biscuit" then it has become really bad, annoying or objectionable. Often used when something has worsened.
Jeff has always been annoying, but his latest stunt takes the biscuit.

Petrol has always been expensive, but these new prices really do take the biscuit.
by MoogleViper February 6, 2012
To be the epitome of something, typically something unpleasant. To stand as the best (or more likely worst) example of a series of things.
Of all the slimy schemes Jim's pulled over the years, his attempt to pay a psychologist to testify in court that Marie, whom Jim had actually repeatedly raped the previous year, was merely paranoid, just has to take the biscuit.
by Fearman February 22, 2008
Chiefly a British idiom. When something "takes the biscuit" then it has become really bad, annoying or objectionable. Often used when something has worsened. Similar (but not identical) to the US version "that really takes the cake".
I know politicians are a bunch of lying fools, but that Donald Trump really takes the biscuit.
by ProfJF February 20, 2017
A phrase used in the Hitchhiker's Guide to the Galaxyseries.
A mild expression of astonishment, similar in meaning to "Well, that's interesting" or "Well DAMN!", but far far more amusing.
X: Hey Y, did you hear?
Y: What?
X: They're actually going to enforce the dress code now.
Y: *pauses* ...well doesn't that just take the biscuit.
by ~tenuto~ November 17, 2004
A term that when used gives people enormous power and strength for a short period of time.
When Larry was losing a fight a stranger yelled from a far always take the biscuit fam, Larry suddenly became a fucking Ninja Master and kicked the shit out of his opponents.
by D_A_M_3727 April 29, 2018
Becoming a slang phrase for “take a shit” in South Africa.
I’m going to take a biscuit
by Stephzsz January 14, 2018