Seriously.5 

Literal Definition: Serious and a Half

Basically, Seriously.5 is an enhancement to a dialogue that is said when the audience is in disbelief at the authenticity of an argument, event that took place etc... The speaker then re-establishes the argument as being Serious.5 which would therefore add extra emphasis to how "real" or "true" the speaker's statement actually is.

Steve: "Yo man, did you hear about Maria hooking up with Julian at that party?"
Dave: "GTFO brother, I was planning on going for that!" (reluctant to believe the story)
Steve: "Trust me, they were smashed out of their minds and I was right there when it happened bud; I'm being completely Seriously.5 right now."

Seriously.5 by JoeySteel January 14, 2010

Shut the fuck up about furries seriously just shut the fuck up day 

On December 23, you must cease all arguments, memes and conversations about furries. This ropes in anti furries, too

Seriously just shut the fuck up about beating furries or being a furry and partaking in these god awful days

"ewww furry art, go kys"

"Careful, you aren't allowed to talk about furries on Shut the Fuck Up About Furries Seriously Just Shut the Fuck Up day"

Shut the fuck up about furries seriously just shut the fuck up day by anonynonmous December 18, 2020

seriously penny 

A phrase used in south dublin whenever one needs to express shock , surprise , a dramatic expression , can also be said out of nowhere to surprise your friends

person#1: No like he said all this to me and then I knew he wasn’t the one

person #2: SERIOUSLY PENNY

...
person #1: seriously penny ??
person #2: SERIOUSLY PENNY!!

seriously penny by bouffbaby69 May 1, 2019

Seriously Aubrey 

Seriously (used to add emphasis), or also to express cynicism or incredulity ('you cannot be serious').

Late 20th Century revival, predominantly in Munster (Ireland), of a term first believed to be in use during the inter-war period in Britain. Neither the origin nor the reason for the revival are clear, but it is thought that there are some examples in the literature of Wodehouse & Waugh.

"Sean was goin' on about us all goin' to the gym before the pub, but we just looked at him, like, Seriously Aubrey, like."

"We tore into them pints last night, lad - I mean, Seriously Aubrey..."

Seriously Aubrey by jp10 July 30, 2009

just kidding... but seriously 

When someone says something that they want to admit but not really but they still think it and they kind of want you to know that they are serious

Freddie: dude that girl is hott... I want to hit that shit
Chris: dude that's my sister
Freddie: I'm just kidding... but seriously

just kidding... but seriously by Chirs Irving October 17, 2006

LOL jk but seriously though 

You say LOL jk but seriously though after you say something offensive to someone or about something.

Only say this on the internet or texting. If you want to say it in real life, say "Haha. Just kidding. . but seriously though".

*It can be reduced to: LOL jk but seriously

Example 1

Lily: Dude, Sally needs to stop making out with everyone.
Mary: I know right! She's such a whore. LOL jk but seriously though.

Example 2
(John is driving his girlfriend's bug)
Bill: Hey, John, can you give me a ride?
John: Sure, man!
(they walk to John's car)
Bill: Whoa. Dude, that is one fruity car. Haha just kidding. . .but seriously though.
John:. . . that's my girlfriends car. .

LOL jk but seriously though by Lily Snape July 1, 2011

CRACK TREATED SERIOUSLY

comes from an ao3 tag - where joke concepts are treated in a serious manner.

"sydno is quite possibly the worst thing we've ever created" charlie said, "a fucking person and a bot just seems like crack treated seriously".

CRACK TREATED SERIOUSLY by MythHead123 October 28, 2021