I have seen a few discusions on attributes, strengh, wisdom and dexterity. However, I haven't seen any on hit points. What do they mean to you? How do you justify gaining more by level up or by constitution?
I see HP as an indicator of fatigue and weariness from combat.
The way I see them, they are not only some indicator of how many hard blows you can take. One really hard blow will kill you whatever happens. A level 20 fighter getting an axe through his brain should die like a level 1 mage getting an axe through his brain should die. (The axe might miss the fighters brain since it's smaller...)
The difference between those characters is that the former has battle training. He will be abble to block the axe with his sword or something. The blow he blocked would then leave him tired and he might have a scratch left by the blow, but nothing really serious. HP from level up and class is how to avoid injury blows your armor/shield didn't block completely or you didn't entirily avoid. It is the deffensive counterpart of your THAC0 getting better as you level up.
I can't really roleplay them by getting severely injured because your fighting capacity stays the same even after you get injured, even on an adrenaline rush you would still feel the effects of an injury, which would end in you hitting less often and getting hit more. Only a character with high CON should be abble to endure some pain, others are just too weak for it. Also why non fighters don't get as much from CON, they don't feel as much pain daily.
Getting close to zero HP means that you are so tired/distracted that the next blow you won't block perfectly (AC) will end up by you dying or getting severely injured after which the enemy kills you.
Come share your opinion on the mistery of hit points!
(This is a roleplay question, I know what hitpoints are!)