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Underfucked 

1. Yo look how hard she's hitting on him... she's definitely underfucked!

2. That guy is completely underfucked. He just desperately asked her out again after she told him to fuck off for the third time...

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

underdecking 

conspiring against an authority figure to take synchronized shits underneath said authority figure's deck. Usually performed in groups of two to five people. In extreme cases, shit burritos are fashioned with paper towels and left to be found.
Oh, no. Have you seen the kids? I hope their not underdecking us again!
underdecking by underdecked July 2, 2009

Cuban Underduck 

When you bend your dick down and back, and a girl blows you from behind with her nose on your butt hole.
"I got a dandy Cuban Underduck from the broad I met at the bar last night."

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
The male genitalia being viewed from an upward looking angle. Similar to the female version of underboob but with a wiener instead. Also referred to as Australian dick.
I knew I was going to have a rough day when I woke up to my roommate giving me some undercock.

Your mom seemed pretty interested in me so I gave her a little Australian dick.
undercock by nubforce November 26, 2010