Gooze is slang for the drug GHB. Gooze is most commonly used in the gay circuit party scene and while the word is commonly used in the party scene all over the world, it was originally coined in San Francisco. It is both a verb and a noun.
Are you boozing or goozing? (v)
Do you have any gooze? (n)
I think I am going to gooze tonight. (v)
I have gooze, do you want some? (n)