What does this twitter hashtag mean?

[Lollie]

I saw many people do this... #bmp
What is bmp?!?!? and I even saw someone post this "Can't wait for some #pmbmp"
I am just curious!
Thank you!

[SRaj]

Twitter doesn't provide a way for users to categorize their tweets or posts. Because of this, users have developed a method of grouping tweets by subject with hashtags.

Using Hashtags
A hash, or pound (#), symbol can be placed before any word to create a hashtag. Hashtags can appear anywhere within a tweet; the hashtag links that tweet to a specific topic or category. For example, "#Twitter" could be added to a tweet about Twitter.

Searching Hashtags
Twitter users can search for tweets related to specific topics using hashtags. Using the previous example, a user could enter "#Twitter" in the search box on Twitter to find any tweets containing that hashtag.