A Spanner Dog refers to those of the human species that are well below the average intelligence. A Spanner Dog will resemble a mouthbreathing, dough banging idiot of a bloke. Common traits include vacant looks, low levels of comprehension, mouth agape, drooling, possible lazy eye.
“God, that Richie is a real Spanner Dog”
“Swing the gate back the other way, you spanner dog”
“You’re being a real spanner dog, just