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When you're totally sleepy but you've got a wild boner.
Some time just fell asleep with the erection, and it stands right there, a zombie erection (zombie boner).
- Man, we take a few pics of you last night, you had a zombie erection, lol!

OR

- *YAWN* You shouldn't peek under the blankets, I've got a zombie erection
by NeatWolf May 29, 2014
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