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Sinceriously 

1. The ability to speak freely, openly and honestly about anything; if you're going to say something, say it sinceriously.

2. To initiate any action while spreading as much good karma as possible.
When I say this I say it sinceriously.

I'm going to sinceriously raise as much money for charity as possible.
Sinceriously by Gingey87 January 17, 2015

sinseriously 

Emphatically exhibits the sincerity of your seriousness. The classic use is to close a letter with it.
Dear Urban Dictionary:


Thank you in advance for considering “sinseriously” in your Urban Dictionary.

Were sinseriously to be included in The Urban Dictionary, that would make my day, perhaps even my week.

Sinseriously,
Cyprus Denton Fekks
sinseriously by Cyprus Denton Fekks February 19, 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"

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 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

Sheriously 

Seriously brought to a new level. Only used at times when the subject you are talking about is an extremely serious matter.
"Are you seriously going to eat that?"

"Yes I am. Sheriously."
Sheriously by Beth Wright May 27, 2013