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1.
If you have been on Twitter, you may have seen a "hashtag." To put it simply, a hash tag is simply a way for people to search for tweets that have a common topic and to begin a conversation. For example, if you search on #LOST (or #Lost or #lost, because it's not case-sensitive), you'll get a list of tweets related to the TV show. What you won't get are tweets that say "I lost my wallet yesterday" because "lost" isn't preceded by the hash tag.

Hashtags believed to have originated on Twitter but, interestingly enough, it is not a Twitter function. Some believe it began when the broken plane luckily landed in the Hudson River in early 2009, some Twitter user wrote a post and added #flight1549 to it. I have no idea who this person was, but somebody else would have read it and when he posted something about the incident, added #flight1549 to HIS tweet. For something like this, where tweets would have been flying fast and furiously, it wouldn't have taken long for this hash tag to go viral and suddenly thousands of people posting about it would have added it to their tweets as well. Then, if you wanted info on the situation, you could do a search on "#flight1549" and see everything that people had written about it.
Take this ashtag for example: #worstjobeverhad. This Hash tag would compel many others to share the worst jobs they've ever had, thus contributing to a fun conversation. It can be used for specific searches or individual twitters that begin them for their followers.

For further clarification on hashtags and for everything for everything else Twitter please visit: TwitterFanZone.com
by itweet November 12, 2010
 
2.
A ridiculous replacement for the "pound sign".
Let's not even set an example for this annoying fad #hashtag #stupid
by Shitbrick1502 June 13, 2013
 
3.
The battlecry to hipsters.
Larry: "My outfit for the dance is amazing, hash tag swag."
Rob: " Shut up hipster.
by Ring King April 22, 2013
 
4.
Recent baby name
Hi my name is Hashtag I'm a potential serial killer.
by watswrongwithamerica November 29, 2012
 
5.
A "hash tag" is slang for the "pound" symbol, A.K.A. "#," A.K.A. a very very small tic tac toe board found on a keyboard and your phone. Used on twitter more than anywhere else now.
Tweets are frequently preceded by a hash tag. Grandpa calls a hash tag a pound sign. Young douches who use twitter call a pound sign a hash tag.
by repealthe1968guncontrolact October 25, 2011
 
6.
The ugliest word ever used to describe this poor little guy right here ->(#)

Yet another social network fad that teaches young Americans to not write in full, understandable, proper sentences.
Me: What's a hashtag?

Friend who never looks up from her iPhone: Well, it's basically a way to...umm...to really express something....uhhmmm, like...yeah...

Me: Why don't you just use perenthesis or an exclamation point?

Friend who never looks away from her iPhone: Ughhhhh, that's booorrriiinnnggggg and it takes too much effooorrrtttt!!
by definitionmaster2013 July 30, 2013
 
7.
The process of trying to unload your drugs on your friends when you are pulled over by the police. Whoever you throw the drugs to then tries to throw the drugs to another friend similar to the childhood game of Hot Potato. The game ends when the cop walks up to the car window.
We were high as Cheech and Chong and driving to Humboldt when due to the sound of the police siren we had to play an epic game of hashtag.
by El Camino Real August 08, 2013