study hole
-(n)- 1.) a confined space where one secludes oneself to absorb information.

2.) a crevice, orifice, or portal where the uptake of new unlearned information is absorbed.
Alex: "hey man wanna come out to the bars tonight?"
Butters: "Nah, I can't, I have to go to my study hole, huge exam tomorrow"

Alex: "bummer"