[from the PDP-10 instruction set]
vt. To plop something down in the middle. Usage: silly.
"DPB yourself into that couch there."
The connotation would be that the couch is full except for one slot just big enough for you to sit in. DPB means 'DePosit Byte', and was the name of a PDP-10 instruction that inserts some bits into the middle of some other bits. This usage has been kept alive by the Common LISP function of the same name.