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tighten up! 

Prison slang for "pay attention". Can also be used to tell another inmate to stop goofing off.
"Yo man tighten up! Don't you see what's about to happen?"
tighten up! by graybar hotel February 9, 2014

tighten up the graphics

1) To work at an introductory-level tech position.
2) To attempt a feat without knowledge of how it can be done.

Phrase originates from a Westwood College commercial, in which two young videogame designers, dressed in 70s attire, report to their boss that they are "almost done with level 3, and need to tighten up the graphics a little bit."
1) "Once I move back to Arlington I'm gonna tighten up the graphics for Adobe Systems."

2) "I'm almost done with my quadratics homework, I just need to tighten up the graphics a little bit."
tighten up the graphics by denshuu September 10, 2005

tight end 

1. A position in American Football.
2. A male homosexual whose anus has not been terribly stretched by the ravages of chocolate love. (See also wide receiver).
He was the best tight end I've ever seen.
tight end by Ian Chode March 20, 2004

tighten up 

1. To get your act together. 2. Don't be so loose
Mary: Sarah you should put your clothes on!
Kelly: Yea, Sarah tighten up!
Sarah: Mary you should stop takin it deep!
Kelly: Yea, Mary tighten up!
tighten up by Joe11 June 28, 2006

tighten it up 

To get one's shit together.
After breaking his sobriety and drinking, Amy told John to tighten it up.
tighten it up by SLAP May 11, 2004

Tighten his shortz 

To give a crossword fanatic a book which contains puzzles which are much, much harder than the ones they are doing right now. It is named after puzzlemaster Will Shortz.
"I just bought Bob that book of Chicago Tribune crossword puzzles. That really oughta tighten his shortz."