What is Backspackle?
1.
After defiling your old lady’s ass doggie style, pull out your pud before you cum, and spray your jizz all over her lower back.
I love to back spackle on my old lady's tattoo.
2.
More of a sniglett, but is very commonly known as the black streak build-up of wet road debris (mostly dirt & who knows what else) that collects on the back of your shirt or coat as you ride a bicycle in the rain.
My jacket was streaked in backspacle from the water coming off of my back bicycle tire after riding in the rain for hours.