Top Definition
1. To lose one's erection immediately after vaginal intercourse in which ejaculation occurs, and the penis is pulled out.

2. To seek sex with partners that fall outside of one's normal sexual partners, as in to "think outside the box."
1. "Wow, I thought I'd never shrink outside the box last night after porking the ole lady. Damn that Cialis"

2. "Man, you really were shrinking outside the box when you hooked up with that field goal post, Frank."
by noumenal December 31, 2008
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