Motivational Poster 

Poster commonly designed for use in schools and offices that generally consist of a photograph centered in a rectangular frame with black background, a title in large text and a description in smaller text.
This kind of poster has been repeatedly parodied and it's a common meme along imageboards.

I lol'd so hard with this Motivational Poster

Motivational Poster by djvangas April 20, 2008

Motivational Poster 

a picture that has a subtitle underneath. were originally used to motivate but the internet changed that by instead of making them they made funny jokes with the subtitle

guy: that Motivational Poster was pretty funny

other guy: yeah but it really didn't motivate.

Motivational Poster by rudy1143 January 13, 2010

de-motivational poster

A take off of the classic 'motivational posters'. De-motivational posters are more often than not sarcastic, insulting, or making fun of something widely known, or comical.

Often a picture bordered in black, with a large single word title written in white, and in some cases a comment below written in smaller font.

Did you see that de-motivational poster on 4-chan?

de-motivational poster by Furofushi February 21, 2009