to rise from seemingly insurmountable circumstances and prevail. taken from the transformation both the comic book hero the incredible hulk and pro-wrestling icon hulk hogan's sudden transformations. The emphasis is however on hulk hogan who regularly powered out of dire straits and "ran wild" on his opponents. This is a particularly useful phrase to use when describing someone who consistently overcomes adversity at the last possible second.
He seems to be doing poorly in this class, but i'm pretty sure he'll hulk up for the finals.