It's like being punk'd but its alot cooler.
Stolz in German means proud. So being Stoltz'd is when someone punks you out of pride. The reason you add the T is because you can't say stolz'd, well you can but it sounds gay. Its hard to explain to people its like tell them the definition for "the" you just can't do it without sounding crazy.
Hahah you called me gay, so I stoltz'd you and left you at Best Buy and didn't come get you.