Can anyone describe to me what "booty juice" does to you at the psych hospital?

I'm 16, I have anger issues, I'll admit that. Mom has been talking about admitting me to the hospital for a few weeks, which I'm okay with, I guess, I do want to get this under control, but she says if I act up she will let them "stick me in the ass with one of those shots", which one of my friends called booty juice.

I don't mean to get mad, but people piss me off, and the booty juice thing scares me, which pisses me off at her, and I don't like that because I know she means well, so to get less afraid I want to know more about it... if I DO have an issue at the hospital, and they do that to me, what can I expect? What does it feel like? Are you conscious at all? Do you remember anything? After?
Can anyone describe to me what "booty juice" does to you at the psych hospital?
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