"Shrooms" refers to certain types of mushrooms with hallucinogenic properties. They are hallucinogenic because of a substance they contain called psylocibin.(sp?)
You should DEFINITELY check out that link in the above post before you eat any. It gives you all the basic information you need to know, as well as som trip reports, so you can have some idea of what to expect.
I wouldn't recommend taking 1/

z. your first time; start small, like one or two grams. Remember - you can always take more, but you can never take less than what you took.
Also, this post should have been in our Brand-new Psychadelics Forum. I'm sure one of our friendly neighbourhood moderators will move it there for you.
------------------
"Not knowing everything is all that makes it okay, sometimes." - Delerium, The Sandman