You can look at many online dictionary's and find it.
I kinda liked the video, which explains how and when it was used, about the misconception that it "isn't a word, and at the end about those who will argue that it isn't a word.
but,......
I am no scholar. the point of the post(my post) was that it didn't matter if it was 25 gallons, 25.357 gallons or 50 gallons, it was now in my Jeep.
So,...
If you want to grammar check me, if you want to spell check me(BTW when I typed it in, I spelled it wrong, much like I do a lot of words, but spell check picked up and give me the correct spelling of the word) or word check me, I really don't give a rats ass. If I use a word, that insults your intelligence, offends you or pushes all your buttons because you can not see the forest because of your nose, I can deal with that. I have thick skin.
Sure I could have used the word regardless, but this isn't a grammar site, or a spelling site, or a dictionary site.
I see a lot of words used that are not in the dictionary. Some that come to mind are:
Asshat
Fucktard
Dumbass
Prick (though it may be a word in the dictionary, but not in the way that is used in a sentence.)
so as Old William Shakespeare said it,
What's in a name? That which we call a rose by any other name would smell as sweet.
If you are so inclined to be "out" because of a word written, so be it.