When she spoke to the crowd, her tone was one of seriousness.

His face showed intensity and seriousness as he strove to define "seriousness."
by Bill Foecke October 09, 2003
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Used to back up a statement that is strongly true.
Person A: Dude, the performance of Berlioz's "Symphonie Fantastique" was the best thing ever!!

Person B: For seriously!
by Sho Fo-Sho March 09, 2009
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asking a question, slang word for emotion thats serious
jason: "she broke up with me and she wasn't even kidding, she was seriousing"
alex: "dude are you seriousing me? you guys went out for 3 years!"
by aakasd420 October 20, 2010
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This term is usually used after saying a non-intended humorous quote or phrase.

This term can also be used to put a serious twist on your joke, and frequently intensifies the situation.

It is also used to make a joke more humorous, this is called backing-up(usually used after your not-so-funny-joke)
#1:
Person 1: Yeh i got a vest the other day!
Group: HaHahahAhAh
Person 1: but seriously

#2:
Person 1: I've got a vest....jokes....but seriously
Group: HaHahahAhAh

#3:
Person 1: Vest are only for 'homos'
Group: *cough*
Person 1: but seriously!
Group: HaHahahAhAh
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Disbelief in sarcastic form.
(As commonly used on the show Grey's Anatomy)
Meredith: You didn't sign the divorce papers. Fine. I get it. End of discussion.
Derek: Oh... I usually just say "Meredith" and then you yell at me. I haven’t thought past that point. I actually didn’t have anything planned. Meredith hits him repeatedly with her purse
Derek: Listen! Hey stop it! Ow!
Meredith: Seriously? Seriously?!
by Laurdev September 15, 2007
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