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The act of doing something stupid or basic which makes you look like a fool.
"That was school boy"
by Martin Loader November 28, 2007
A person who get's straight A's in school
Michael: Hey, look at my report card. I got all A's bitch.
Samuel: Ah! School Boy!
by Amos Nusheg October 08, 2007
1. An error made generally through lack of experience. A shortened form of schoolboy error
2. Derogatory phrase used when someone makes an error or goof or misplays

See also schoolboy defending
*Brad makes misplay*

by Eddie Ross June 28, 2006
THAT KID in grade/high school that never did anything wrong in fear of the repercussions, i.e. bad grades, people thinking less of him, or getting yelled at by mommy. usually a tall lanky kid that goes to college and becomes a pothead!
why do you study so much lapo, your such a SCHOOL BOY!!!
by jg85 December 30, 2008
A way of pissing urinating against a wall during a drunken state whilst pulling your keckstrousers (including undiesunderpants) down to your ankles and lifting up your shirt. This is known as a schoolboy as it replicates the way little children piss in urinals in public toilets and the way we all pissed as a school boy. A true schoolboy will involve pissing no handed whilst holding up your shirt with both hands.
"Did you see Callaghan doing a Schoolboy at Leedsfest whilst Arcade Fire played? What a dire choice of headliner, although they are a great live band and help Leeds maintain its musical credibility".
by SchoolboyCallaghan August 31, 2010
British slang. Short for a "schoolboy mistake".

1. A trivial mistake that an inexperienced person might make.

2. A short-sighted mistake that could have been avoided with more care.

Similar to a "rookie mistake" in US slang.
You wore sneakers to the hottest nightclub in town? No wonder you got turned away at the door. That was a schoolboy.
by wizurdUvRythmn February 28, 2011
Slang-term for Codeine back in the day.
Man, I am high on schoolboys! Let's hang out after school and do some schoolboys together! Pastor John is in rehab for doing schoolboys. Can I get a schoolboy from you?
by 68whisky February 21, 2011