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1.
Stop Huntingdon Animal Cruelty

Huntington Life Sciences tests on animals that are harmful and fatal for companies around the world. At any given moment they have 70,000 animals on site and approximately 500 animals are killed every single day.
1) SHAC will never stop until HLF is shut down.
by BahBahBlacksheep3333 September 11, 2009
 
2.
1) Super Hot Asian Chick.
2) Generic nickname for any such girl.
pronounced "shack"
1) Dude, that girl in the short shorts is a SHAC.
2) How did your date with SHAC go?
by DavidH August 26, 2006