Portmanteau of "ELECTROnic" and "SPAGhetti". Any confusing mass of wires or cables, typically appearing behind large devices such as computers and televisions. Organised cables do not count; wiring only becomes electrospag once it becomes difficult identifying which cables lead where.
"Holy hell, did you see behind Jim's computer? Cables everywhere!"
"I don't know how he manages to work with all that electrospag back there."