An ill advised and unsuccessful attempt to challenge an established (though perhaps blatantly unconstitutional) law with a case that is destined to lose, characteristically featuring a less than ideal (Guilty, for starters!) client who is usually already found guilty of something. Also refers to the bad case law resulting from that attempt, often long lasting.
A visible historical example is US v. Miller, 1939.
"We wanted the question answered in a good case on behalf of law-abiding, decent people instead of the usual way that Second Amendment cases had gone up through the court in cases like US vs. crackhead, US vs. bank robber." -- Alan Gura