George Zimmerman -- You Can't Divorce Me ... If You Can't Find Me

George Zimmerman's divorce proceedings are on hold, TMZ has learned ... because he's gone Bigfoot on his wife.

The divorce can't move forward until George is served with papers, but his estranged wife Shellie's lawyer tells us, George is MIA.

The lawyer says he can't find George anywhere and has no idea how to track him down.

Sources close to George's family tell us they're in contact with him -- and he's safe -- but they don't know exactly where he is. We're told George plans to lay low for the foreseeable future.