You're so boring that you make war veterans die quicker, and yet they're still on life support.
Extreme Boredom
Explanation
Explain Bear
Okay, smoothbrain, this joke is saying that the person is SO incredibly dull that even a war veteran, who's already tough and clinging to life on machines, would rather just kick the bucket faster than endure another second of their tedious presence. Get it? You might even be this boring, little buddy.