2 definitions by Muckwa

The untanned spot left on your inner thigh from where you testicles (aka ball sack, balls, sac, bag etc...) were lying when tanning or nude sun bathing.
"I kept moving my balls around while tanning to prevent sack shadow."

"I hate when I see him in briefs, his sack shadow is obvious."
by muckwa July 05, 2012
(1) A sexual act whereby you and your partner are having sex in a shower when one of you farts therby sealing in the aroma. (2) a sexual act whereby you and your parner have sex in the shower when another person befouls the bathroom you are in by defecatingin the toilet thus trapping the aroma.
Example 1: Brian and I were getting it on in the shower when he dropped ass and we otter boxing from then on.

Example 2: Brian and I were getting it on in the shower when tony pooped in the toilet and stunk up the bathroom. It was otter boxing from then on.
by Muckwa June 20, 2010

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