When a zip fly bulges in such a way as to look like a huge erection.
Mr. Abc: Aw dude control yourself!

Mr. Xyz: Relax, it's just a zip dick.
by CassAndTom April 3, 2010
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When your zipper catches the skin on your penis

Usually rips your penis skin (foreskin)
FUCK I GOT A ZIP DICK AGAIN
by PLPLPLPLP December 22, 2021
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