concentration 

The act or process of concentrating, especially the fixing of close, undivided attention.

If you have great powers of concentration , that means you're able to focus all your attention on the matter at hand.

concentration by Mariendra March 11, 2014

Concentration 

What they did to the jews

Person 1: Yo Hitler sent those Jews to concentration camp so they could think right?

Person 2: no nigga. They died
Person 1: damn

Concentration by DikInYoMouf69 June 29, 2018

Concentration douche face

The equivalence to resting bitch face, only this is the face made whenever someone is reading or working.

"Yo man you look really pissed. Is everything okay?"
"Oh yeah. I just have concentration douche face."

Concentration douche face by Jumbawumba April 2, 2015

concentration tongue 

Much like drummer tongue, the act of unconsciously sticking the tongue part way out of the mouth while performing any task requiring concentration.

Billy must find colouring difficult: his concentration tongue is sticking out.

concentration tongue by Chibi Jeeb December 27, 2010

Concentration Cramp 

An alternative name for a headache.

Discomfort experienced when an individual has been focusing on a task for too long and needs a break.

"All this cramming for our European history class will be worth it when we get an A"

"I sure hope so, memorizing all the dates is giving me a serious concentration cramp"

Concentration Cramp by ratherdashing April 1, 2017

Concentration camp 

A place where a tyrranical goverment sends a group (or groups) of people that the leader/leaders of the tyrrany doesn't/don't like. Often times, it is a closed-off area that is surrounded by barbed-wire fences and search towers. The main reason that the tyrannical government sends these people to the camps is because they want them killed off because they think that that particular group of people is inferior or a danger to society. Not many people survive these camps.

"My grandfather was sent to a German concentration camp because he was Jewish. He's one of the lucky Holocaust survivors."

Concentration camp by Jan Rybicki July 20, 2008

Concentration marks 

The red marks you get on your elbows/forearms from resting your arms on your knees after having spent a long time on the toilet.

"Dude, you were in there for a really long time!"

"Yeah man, I was taking a massive shit."

"Bro, you've got some serious concentration marks. Look at your elbows!"

Concentration marks by Ruffa October 12, 2013