Tha Carter Lil Wayne
Referring to having his victims of a robbery face the wall while he makes off with their possessions. This is akin to the last scene in the 1999 film The Blair Witch Project where the main character is seen in a cabin facing the wall.
In a 2-story house, the second story floor is clear or made of glass so you can see who is directly above you upstairs.
since you've expressed interest in purchasing drugs but i don't know you, here are some drugs that i would like to see you inject into your bloodstream in my presence so i know you aren't an undercover police officer trying to catch me selling drugs