When your dick is so hard you can't even grab any skin with a pair of pliers,like after the 5th week of boot camp.
On Johnny and Zelda's wedding night he had a Blue Vein Throbber that wouldn't quit.
by Jorge.D May 05, 2006
when the dick is at its fullest erection,when the vein in the penis is sticking out due to extreme horneyness.
come here baby, and relieve this big "blue vein throbber".
by randall March 21, 2003

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