What does 12ing mean?

12ing meaning in Urban Dictionary

Verb- Act of showing support for Seattle Seahawks by proudly displaying jersey's and other gear, and by displaying #12th guy flags. 12ing should be done as frequently that you can if not all the time. If you see a fellow 12th man or woman 12ing, yell "SEA-HAWWWWKS!!!!" to exhibit your pride. Post photos of your self 12ing whenever you can! GO HAWKS!