Top definition
A hashtag on social media platforms such as Twitter or Instagram that is unnecessary or ridiculous, and is therefore colloquially defined as being 'gash'.

As a general rule of thumb, people who gashtag don't fully understand the concept of hashtagging - that by placing the # symbol in front of words designates them as search terms for other users.
Generic tweet: "OMG Made In Chelsea is on #imsoinlovewithspencermarrymeplease" - this is a gashtag because no one is going to type that in to a twitter search and clicking on it is unlikely to show any other tweets because the tag is so ambiguous


New photo on Instagram: New dress #selfie #lipstick #and #lashes - in this case 'and' is the gashtag, it is unnecessary because 'and' is not a term most users will want to search for, and if it is, they probably weren't looking for a selfie from a pouting teenage girl.
by Marky14Mark June 19, 2013
Get the mug
Get a Gashtag mug for your cousin Vivek.
Expressing your appreciation of a hottie on twitter via the use of a hashtag
John: Look at that girl's display picture

Adebayo: I'm gashtagging that #gashtag
by Adebayo Akinfenwa February 01, 2012
Get the mug
Get a Gashtag mug for your brother José.
Hashtags made by and for lesbians. The symbol is the same, but the word behind the hashtag will be used to lesbian Twitter users. It's a woman power thing.
The word "gashtag" is not necessarily used in a sentence, just used to describe to your buddies a lesbian based hashtag. #lesbiansunite
by Markseagle October 16, 2017
Get the mug
Get a Gashtag mug for your Facebook friend Trump.