Definition of Schoolboy error...

"getting the basics wrong" ... especially when you should know the answer
Expecting to be able to buy tickets "on-the-door" when U2 are coming to play in the Village Hall that night... to discover that all 250 were sold out months ago...
by Ian Cameron November 14, 2003
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Schoolboy Error: (n.), (der. old English), A mistake, often trivial, clumsy, dimwitted or easily avoided. Generally shameful in hindsight, but without cause for embarassment, owing more to circumstances or instantaneous bad luck, rather than serious incompetence of behalf of the maker. Derived from the "trial and error" psychology present in Victorian-era English public schools.
Upon dropping the soap in the Violent Offenders' Wing of Barwon Prison, Eric cursed his schoolboy error.

Dr. Feynmann lowered his glasses as the fruit of twenty minutes labour yielded an unwanted result: E = mc^2/0. "Well fuck me", he said, turning to the class. "I seem to have made a schoolboy error."
by Jerkov October 6, 2009
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For a person of experience to make an error in a situation where she should know better.
Often used by soccer fans in the UK when describing a naive or careless error by a professional player.

"Blimey... that's a bad mistake by Beckham. A real schoolboy error!"
by A Hume February 3, 2007
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a nigga in the hood is smart want to go to college,study for test,and doing good in classes
gangsta 1:man he is one smart nigga
Gangsta 2:yeah that's why nigga he go to school everyday you dumbass
Gangsta 1: that why everyone in the hood call him schoolboy nigga
by slim thug jr November 22, 2014
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When an adult male uses a public urinal, but drops his trousers and pants to the floor, revaling his bare arse.
Did you see my mate Jacob in the toilets, pants at his ankles! A schoolboy piss master if I say so myself. Shall we get a drink?
by _The_GP December 20, 2018
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sexual act. related to the shocker. While in the doggy style position you stick your thumb in the anus of your partner and apply downward pressure in order to feel the curvature of your penis inside her.
I gave that hoe the dirty schoolboy and she loved it.
by the dirty little schoolboy October 13, 2011
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The most basic of errors. An error so simple, and avoidable, that anyone with an ounce of credibility or experience in that field should not be commiting it. A mistake that should only be made by school boys still in training for that particular task. Especially used when referring to playing games of pool in pubs, or occasionally during snooker. Schoolboy error can be heard ringing out by jeering onlookers if for instance a participant missed a sitter = he should have potted it as it as so simple, that thereforehe is reduced to the level of a lowly school boy playing his dad for the first time.
And here comes Keane for the winner....Oooooooh and he's missed, and left the black right over the pocket for Swann to tap in...
Schoolboy error!
by GF November 2, 2007
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