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(n) the fecal remnants of an exceptionally dazzling rectal eruption.

(v) to create a shotgun-like blast of gas, as evidenced by the presence of tangy, sticky poop-a-ledge on the rear of undergarments.
"Dude, that tomato soup/burrito lunch combo generated an industrial case of boxer spackle for me during the afternoon meeting."

"Melinda and I broke up. She stayed with me last weekend, and ran around with just my boxers on. After she left, I discovered she's Boxer Spackled my favorite Batman Underoos."
by CrackScrubber November 19, 2011