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2.
n. A genetic hybrid combining the DNA of Pacific Lobster and Tiger Shrimp resulting in what can be described as a small lobster or a very large shrimp. Usually served (in limited quantities) at all-you-can-eat sushi restaurants.
I ate a bunch of those roid monsters last night, but they always look better than they taste.
by F. Rodderick Hsu May 27, 2005
 
1.
Short for steriod monster. Someone whose overuse of steroids renders them notably different from the human norm in some respect(s). Typical characteristics include: huge gnarled muscles, bad temper, irritability, leathery skin, grotesqueness of features, puffy, constipated, pain when urinating.
The 'roid monster snarled at all who approached as he stood wimpering at the urinal.
by Figleaf23 August 12, 2007