Wobbler is cobbler with weed baked into it (weed+cobbler = wobbler), much like "special brownies", but fruitier and more delicious depending on your dessert preference.
Stoner 1: "Hey, man, you want to come over? Stacey's making cobbler! With weed!"
Stoner 2: "Oh, you mean wobbler? Fuck yeah! I'm there!"