Know Your meme (URL: KnowYourMeme.com) is the official internet meme research database with over 500+ confirmed memes.

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A reply to a thread on 4chan's /v/ board about the Wii game The Conduit. Due to it's complete and utter lack of coherence, and therefore high comedic potential, /v/irgins jumped on it and began to spread it across the rest of 4chan and Youtube. Extensive research has ended with this meaning (from knowyourmeme.com):

FROM: knowyourmeme.com/memes/tenso

About
The word “tenso” is Portuguese for “tense”. This is a meme that spread through Brazilian blogs and forums, and consists of an image edited to form a sequence that closes up the frame and emphasizes a “tense” face or situation. In form, it is similar to a common vertical 4-Pane, a common exploitable format; although the number of actual frames may vary.

Sometimes the close up reveals something that is not seen in the original image, creating an effect of surprise. In this way, it delivers an effect similar to the when you see it, you’ll shit bricks meme.

Origins
This meme started as a joke in the Brazilian gaming forum “Vale Tudo” (UOL Games). Some of the members of this forum claim that it is inspired by 4chan memes and was adapted to Portuguese language, but it is not clear if a specific meme served as inspiration, or if it was instead the common vertical panel format to which they were refer.

In late 2008 the idea started to spread to other forums and became a fad in brazilian blogs and social medias.

A crazy sex move white people do!

When friends join together to drink or hang out only to inevitably end up in someone's room or on someone's laptop watching YouTube videos, YTMND links, KnowYourMeme.com, etc.

Do you have no sense of humor, wit, or originality? Look no further than the book of memes! They're easy to memorize and other meme users will find them hysterical each time you use them. Memes are emergency words, phrases, and media created by the social networking community that everyone uses when they can't think of anything else to say. Eventually they become so dependent on these memes that every single joke or insult they pop comes straight from the book of memes! Refer to the KnowYourMeme website for all memes.

The term "murica" is the way how many people with extremely thick, American accents, pronounce "America". The term is used to denote extreme, extreme nationalism and patriotism, but not necessarily facism. It is generally seen as a derogatory yet humorous way to describe most Americans: fat, lazy, gunwielding, war loving, horse riding, saloon fighting, beer drinking, sex wanting or etc.

according to knowyourmeme, murica originated from a post in 2003, but then re-appeared a year later from the red states who voted for George Bush's re-election.