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A colorful and friendly way to refer to the male genitalia. Rolls off of the tongue (no pun intended) easier than penis, pecker, who-who or wang wang.
"Dude, the other night my deeack was so hard I could cut diamonds with it" "Man, my boss is such an F'in Deeack!!"
by Mr. Deeack December 23, 2007
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