1.) Save The Freaking Unicorns
2.) Say, Thanks For Understanding
3.) Short Term Follow Up
4.) Special Task Force Union
5.) Stop Talking Find Username
6.) Slippery Teflon From Utah
7.) Stinky
Telnet Fell Under
8.) Special
Transitory Food Units
9.) Stealing Turkeys From Uncle
10.) Superior Tactical
Fragging Unit
11.) Silence That Followed Us
12.) South Texas Farming University
13.) Southern Tenant Farmers Union
14.) Scrawny Two Faced Underling
15.) Samurai Training Finished Unsuccessfully
16.) Show Them Fury Unleashed
Or the most common definition:
17.) Shut The Fuck Up
The common response to the previous 16 definitions.