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3.
A racist term to describe people of Asian or most commonly Japanese descent. The term is used to compare Asians to turtle like creatures with yellow skin from the popular Nintendo game Super Mario Bros.
Fucking koopas, how can they read all those math books through those slanty eyes?!
by Frances Fuglet October 11, 2009
 
1.
1. Nintendo characters; A race of turtle-like reptiles that come in all shapes and sizes. Most of them are Bowser's servants, but there are also a lot of good Koopas. Bowser's Koopas have many various soldier ranks, most common of which is "Koopa Troopas" (which is another word for "troopers", if I'm not mistaken).

2. Koopa is also the name of their king. Koopa or King Koopa, also known as Bowser or Lord Bowser. But anyone who watched old Mario cartoons or played Super Smash Bros. Melee on Japanese mode knows that already.
Ahem. Anyway, his full name (as far as I know) is King Bowser Koopa.
1. "Uh oh. There's an army of Koopas approaching us."

2. "Hi, Master Koopa! Whatcha doin'?"
by M. the gamin' gangsta July 24, 2005
 
2.
A koopa troopa that has not yet ascended to the rank of troopa. May work in a grocery store or gas station. If it does not become a troopa within one year, it is put to death by squashing.
"That koopa is a waste of pixels. Lets go jump on his unshelled ass. Then we'll go get a pizza and do some plumbing."
by Luigi Mario March 03, 2005
 
4.
It was first commonly used while cruising around the "Beach" (a specific area) of Toronto in the summer of 2007. "Koopa" is correctly used when you drive pass an ugly person in your car and yell the word "koopa".
"Oh shit man roll down the window"...(window is rolled down)... "KOOPA! KOOPA! KOOPA!"
by reinprecht November 07, 2007