First of all, I need to explain the distinction between linguistic, and the most common conceptual memes. The later are purely semantic ones and owe their existence to culture and possibly historical contingencies. A good example may be the meme God. Linguistic memes carry no semantic weight in their own right. Instead they play the role of grammatical devices which serve as cues to the listener how the context where they appear should be interpreted. They resemble the function of case markers.
One common meme is the term "like". From my observation it serves (in most cases) the role of pre-empting a description.