Erin

(noun) A big hammer (in a game or IRL) can be named "An Erin" or "THE Erin". If it breaks knees, it's preferable.

"Wow, bro! Your Erin really smashed that giant!"
"I like my Erin a lot. She does omega damage"
"Did you see the cool Erin I made for my cosplay last week? Can't wait to smash some knees!"