fiendishly 

totally focused , without regard to anything else

That skateboarder was fiendishly focused on that trick.

fiendishly by thunderzap November 27, 2011

fiendishly shadowing 

To fiendishly shadow is to watch hentai for over 48 hours, and only stopping to eat. Frequent fiendish shadowers will often become fiends, and will normally be morbidly obese because of the nature of the activity.

Wow, fiend was actually fiendishly shadowing last week. I thought he was just sick, but he still smells like cum and pizza.

fiendishly shadowing by CowCentralTootToot February 27, 2019

fiendish 

Devilish,spiteful,,frightening,alluring ,

The masked man said in a fiendish manner...
It was a fiendish place to look at...
The girl danced in a fiendish manner...
Grimly Fiendish...The Damned

fiendish by Fiendish Female April 21, 2006

fiendish 

Used to describe something (eg. an all-nighter) a bit mad/crazy/wicked etc. for various reasons, usually relating to alcohol/drug intake.

"did you see how many bennie's kel did last night?!!"
"yes! he had such a fiendish one the nutter!"

fiendish by little sister of eluria July 1, 2006

fiendish 

the way to be.

Did you see that girl? She was so fiendish i got a stiffy!

fiendish by FiendishPhoenixx February 3, 2004

Fiendish 

Fiendish: A Scottish catchphrase

The quality or state of fiendishness/being fiendish.

Can refer to sex, cool things, cute things, difficult things and things that capture the essence of spooky, radicalness and more.

"We were fiendish last night" 😏

"That's so fiendish!" 😈

"My dinner was so totally fiendish"

"That music artist's new album was hella fiendish."

"My gym session was so fiendish!"

Fiendish by Lil Fiendy November 28, 2021

Fiendish fiend 

Someone you absolutely despise because they have annoyed you for so long. Usually used in a comical, or sarcastic sense.

Person A: You Fiendish Fiend!
Person B: Hah! got your nose!

Fiendish fiend by Lord Jonathan Elton June 9, 2015