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1. H1N1 Swine Flu

2. Disease people get when they join HOG (Harley Owners Group). HOG membership comes with the purchase of a Harley Davidson motorcycle. This new sense of club membership often is attributed to Rich Urban Bikers (RUBs) where they pretend they are in the Sons of Anarchy Motorcycle Club. They're usually just doctors or lawyers with too much money, dressing up like it's Halloween and playing bad-ass. You can immediately tell somebody has Hamthrax by the HOG patches on their jackets and puffing their chest out. Though they wish they were real bikers, don't let them confuse you, they're not. You never see riders with Hamthrax on the road unless the sun is out and it's 70 degrees or warmer.

3. Disease of the Lemmings that just LOVE Harley Davidson, but don't own one. They have all the other important gear, like the T-shirts, jackets, Harley Davidson Wolf Blankets on the bed, big stickers in the window of their truck, Harley Davidson golf balls, you know, all the crap they sell that's not a motorcycle that makes up a large portion of their revenue. These guys typically will be the first to lick your boots if you ride one and tell you about all of their friends that ride and about the Honda they rode back in the 70's ad nauseum.
"Check out that guy on his Harley, he must be a bad-ass."

"No, he's just got a bad case of Hamthrax."
by SeattleEvilDave October 18, 2009
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An alternate name for the H1N1 or "swine flu" virus originating in Mexico in April of 2009.
Greg: Hey guys, has anybody seen Joe since he got back from his spring break trip to Cancun?

Laura: I heard he's home sick with hamthrax.
by teh_cynic May 01, 2009
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I hope I don't get the Hamthrax, I heard it's just like the flu but you also get the runs.
by caitM May 01, 2009
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