fuck the dog

to screw the pooch; to mess up
When you fuck up badly e.g fumbling a 10 or poorly hiding the dismembered remains of your teacher Mr. Finn when he asks you why you're late for the 3rd time this week

James: yo did you recharge the cart?
Kendrick Lamar: nah dog I totally forgot
James: dude you fucked the dog on that one
fuck the dog: to screw up