Someone who's amazing at a certain thing; taken from the actual drummer with the coined nickname "Hellhammer" From the Black Metal band 'Mayhem', or in the drumming world, someone who pounds the drums incredibly fast and keeps rhythm and consistancy.
"Jesus, it was over in a second, he just came up and hellhammered that punk."
A very coolway to say hilarious by replacing the "hi" with a "hello".
Person1: "Hey Jen did u see how Patrick got owned?"
Jen:"Yeah that was hellolarious!!!"
Person1:"Oh god Jen shut up with that word it sounds retarded"
Jen:"*sniff* ok"