1. Harsh or bitter derision or irony.
2. A sharply ironic taunt; sneering or cutting remark.
1. The process of an image or idea being turned into a meme, shared concept, and becoming part of a cultural zeitgeist.
EX. The above .gif animation is Neil deGrasse Tyson's response to the memefication of his image into the "Watch Out (or Hey Whoa) We Got a Badass Here!" meme. This symbol of sarcasm is usually used as a response to the rant or over exaggerated boast of an individual on the internet.
The sad irony of this concept? The original context of the image was his exasperation over those who would argue with Newton. Regardless of the original intent, it is nice to see that one of the world's most popular scientists understands the meme and embraces the concept.
Maybe some other people out their, ex. Xzibit, could take a hint?