Gírias (U) Slang

umpteen: many; countless.

"I've asked you umpteen times to show me the money!"

unlax: relax.

"Dave needs to definitely unlax with his family."

upchuck: vomit.

"She got sick and upchucked three times."

uptight: nervous; anxious.

"Why are you so uptight?"

Source: http://www.eslcafe.com/slang/u.html