A person who enjoys experimenting with psychedelic drugs.
Referencing Lewis Carroll's Alice's Adventures in Wonderland and Alice's literal trip down the rabbit hole.
Hey there stranger are you a Friend of Alice? Then I've got just the psychedelia for you!

What's with your friend Gary? He's been in the corner laughing hysterically and taking to the wallpaper for awhile now.

Oh Gary? He's a Friend of Alice.
by Sick Trickle February 24, 2021
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Pedophile. In reference to Alice in Wonderland. Which was probably written by a pedophile.
Mr Dodgson appears to prefer the company of girls rather than women. Perhaps he is a Friend of Alice.
by MockTurtle October 22, 2016
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