Flashtag

To sum up your Twitter post in one word

My Mum is singing campfire hymns #Mumbyah ...I totally flashtagged that one

Flashtag by GoggleboxUK May 12, 2015

Flashgag 

1. A puking sensation induced by the smell of a particular alcohol with which you have unpleasant memories.

2. A vivid, usually personal, memory so cringe it makes you gag.

In chemistry class

Ella: Luna, can you add that ethanol to the solution?

Luna: Bro I can’t, way too many flashgags.

Flashgag by FlashySofie July 18, 2019

Flashtastic 

Originates from the DC Comic cartoon character - The Flash.

It is used to describe things that are superhumanly amazing, and awesome, pretty much THE best thing EVER.

It can also be used as an alternate form of the word "go" when playing games.

Typically it is best used to describe activities that you want kids to get REALLY stoked about.

Alright guys! This game of dodgeball is going to be FLASHTASTIC!

Ok kids, when I say "flashtastic" you are all going to spin around 20 times and then begin!!!

Those tater-tots are flashtastic. totally.

Flashtastic by the JR January 1, 2009

Flash Tag 

When using FB check-in and you tag not only the group you are with, but start tagging random people in your friends list causing havoc.

Eddie checking his FB feed: Damm it I got Flash Tagged again! If my wife sees this she'll think I was out again and I'm gonna get cutoff.

Flash Tag by Mikeyl16 May 17, 2011

fashtag 

A hate symbol used by neo-nazis and the racist alt-right, typically Trump supporters. The symbol(#) makes two H's which stand for Heil Hitler.

OMG he used a fashtag that is racist

fashtag by Coronatus May 26, 2019

flashtango 

When a female removes her pants and dances on a male while wearing only panties or thong.

Guy: Dude, she just flashtangoed with me!

Girl: Can I flashtango on you?

flashtango by Taylian March 27, 2012

flashtights 

When the sun beams down on your leggings/tights and everything underneath is completely visible.

Oh no, Baby, what is you doing? You have flashtights.

flashtights by Rkw0220 July 6, 2018