A Spiderman is somebody who either speaks in a racist Indian voice, pretends to climb walls like Spiderman or is just a complete idiot. It also means Vegan in a tree
Person A: Hey dude, look at that weirdo!
Person B: Yeah, he speaks in a really racist voice. Look! He's trying to climb the wall. Stupid
Person A: You mean Spiderman, right?
Person B: Oh yeah! He's a Spiderman!