A type of blotter paper LSD. It was pretty common to come across in the 80s and 90s. It is famous because of the rock group, Tad, whose second studio album was entitled 8-Way Santa.
Dude 1: Yo dude, you know where I can buy some acid tabs?
Dude 2: Yeah dude, I know a guy.
Dude 1: Is it legit?
Dude 2: Yeah man, it's straight 8-Way Santa, I tripped on that last month, crazy.