The act of using your penis while it is erected as a shanking device. This does no real damage.
Steve: "Dude, do you see that hot girl over there?"
Miguel: "Dude, yea!"
Dante: "What are you gonna do, man?"
Steve: "Don't you mean what are YOU gonna do?"
Dante: "I know. I'll homo shank her ass."
Miguel: "Bitch, that's my job!"