LSD, a 'hit' of 'acid'
A small square of dried translucent substance containing a ‘hit’ of acid, that is, LSD, and resembling a ‘gel’ used in theatrical lighting. It dissolves in liquid, melts in your mouth.

A form of acid from the 70s. It came in colors (pun intended) such as amber and brown. Hence the name Amber Windowpane.
I took a hit of Amber Windowpane about an hour ago--man your face looks weird.
by LoganC October 13, 2006
Get the Windowpane mug.
Another word for the drug Acid/LSD.
When Cassidy tried some windowpane she thought she was having a bad trip.
by Babydoll75 March 4, 2019
Get the Windowpane mug.
Doing an ungodly amount of acid. In regards to a metaphorical windowpane you’d be existing through after the trip.
Joey did a windowpane last year, and he’s never been the same since!
by Grobbster February 28, 2023
Get the Windowpane mug.