HARDKOA=hardcore 
Hard.
härd/
1. solid, firm, and resistant to pressure; not easily broken, bent, or pierced.
2. requiring a great deal of endurance or effort.
Koa.
1. Brave, fearless; bravery 
2. Soldier, warrior; martial
3. An endemic forest tree (Acacia koa) the largest and most valued of the native trees.

Together HARDKOA represents the action of effort, fighting for what you want in life.  Fearlessly doing your best at whatever you do, going HARD; because "if it's not hard, it's weak."