Interesting question, thanks for posting it.
Since being blessed to have hunted buffalo, (albeit only one time so far), I chose it to be my Avatar because I am not positive that I will be able to hunt them again (not getting any younger - and for that matter, any wealthier either).
For my screen name I originally chose "Aardvark" because that is what I have been called since the first grade (my last name is Ard) but, it was rejected due to already having been taken by some other member here.
So, I cast about and settled on Velo Dog, because I am shade tree firearms enthusiast and although the "Velo Dog" revolver was a historically insignificant firearm but nonetheless of interest to some armature collectors like myself.
It seemed to be the opposite of anything pertaining to hunting in Africa and so humorous, even though only in a weak humor sort of way.
"Velo Dog" is the nickname of a tiny revolver, once popular in Europe, for shooting mean dogs that chased people who liked to ride bicycles and "Velocipede - Anti Dog" or something like that was the whole name.
Some people also depended on it to ward off human criminals as well although I am happy to say that I would not ever have staked my wretched life on such a puny weapon.
Generally speaking, I do not use my real name here very much because I have been stalked before and although, I am not one to be rattled by criminals and / ex-wife, etc, I do worry about my family some of which are not as proficient with a .45 as I am, (especially my dog, he doesn't even have opposable thumbs and therefore does not usually carry a pistol).
Cheers,
Velo Dog.