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USA: A neutral term to refer to clumsiness. Unlike its UK counterpart, this has absolutely no negative connotations

UK: An incredibly derogatory term referring to people with cerebral palsy, in a similar way retarded is often used as an insult around the world.
Imagine a wobbly train acting crazy

USA:

American Student: "Man, that train is so spastic."
American Teacher: "Yeah. It probably needs some fixing."

UK:
British Student: "Wow! That train is spastic."
British Teacher: "Derogatory slurs in class? DETENTION!"
by sega31098 November 11, 2014
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2
Someone who walks with their head angled 30-45 degrees to the side, one of their arms in a crooked position, their feet turned inwards (like Kevin Spacey in The Usual Suspects), walking down a street, with the occasional noise (like that dude in Cube) "Errrrrahhhhhhhh".
Whenever Dave did something stupid, we'd do the spastic impression on him "Errrrrahhhhhhhh".

Us Brits are the masters of doing insulting impressions such as the spastic and wanker impression.
by akminder February 24, 2004
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3
1. Relating to, of the same nature as, or characterized by involuntary muscular contractions, esp. the long-continued contractions known as tonic spasms.
2. A person afflicted by such spasms; a person suffering from cerebral palsy.
"Christine is very spastic."
by DiiKaBaKa January 23, 2004
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4
an absolute fucking retard which, by no means, does anything right or tries to give a fuck.
That kid with the black shirt is the biggest spastic I've seen in my existence.
via giphy
by There'sonlyJuanlikeme March 23, 2016
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5
1) A retarded person not to be laughed at in a cruel and heartless manner.

2) A brave person.

3) An insulting name given to a mentally or physically handicapped person.
Person 1: I've just spilt gravy over my X-Box.
Person 2: Dude, you are such a spastic.
Person 1: That's out of order, don't say that.
Person 2: Sorry, I meant to say you are a 'Practicality challanged person'.
by Matt Bateman May 09, 2003
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6
also known as spazz or spaz, means to act like you have ADD (Attention Deficite Disorder) . Usually bouncing off the walls.
wordwtf/word you worddouche/wordwordbag/word?! you're such a spazz!
by DarkFoxFurre May 10, 2003
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7
what a spastic!
by KATTAY! May 24, 2003
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