Undiefucking 

The act of dry humping in ones undies is called Undiefucking.

John found Audrey undiefucking another man in her fishnet undies.

Undiefucking by Nathan Eastan October 10, 2007

underfuckingstand 

When you don't understand something and you are super pissed.
When you don't feel like saying "fucking understand"
When fucking understand just doesn't quite display the needed emotion.

"I don't underfuckingstand why your acting like this"

underfuckingstand by Desiree Aho January 9, 2008

underfuckingstand 

underfuckingstand - Understand, with "Fucking" inserted in the middle, making it an exclamation of frustration or, in some cases, a joking statement.

"What part of this do you not underfuckingstand?!?" or "I dont underfuckingstand!"

underfuckingstand by Steve October 24, 2004

Unbefuckinglievable 

Like unbelievable, but with a swear to kick it up a notch for people who just can't believe what just happened.

"Unbefuckinglievable," Jan said, after getting another term paper that week.

Unbefuckinglievable by Ashleybobashley xD January 20, 2009

unifuckingcode 

See Unicode. This variant is usually used by irate programmers who just can't get the conversion between unicode and non-unicode data types right.

Fuck this unifuckingcode fucking shit!

unifuckingcode by Aalaap September 9, 2003

unbefuckinglieveable 

unable to be believed

dubya is STILL president? Unbefuckinglieveable!

unbefuckinglieveable by cutefuzzysquirrel May 7, 2003

unbefuckinglievably 

a word used to describe a special someone, prefferably viv. Also meaning: Bangin, fire, hot, sexy, pretty, fuckin' adorable, sweet or cute...

"Unbefuckinglievably" is an irrestistable word derrived from the hippos at the blueberry lake behind viv's house.

"Viv is so unbefuckinglievably hot!"

unbefuckinglievably by Hippo-pot-amoose christian March 4, 2008