drain the main vein

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Related to vein: varicose vein, portal vein

drain the main vein

vulgar slang Of a male, to urinate (where "main vein" is slang for the penis). Will you order us another round of drinks? I'm just going to go drain the main vein real quick.
See also: drain, main
References in classic literature ?
For, after these things, it is not necessary for me to say anything more with a view to explain the motion of the heart, except that when its cavities are not full of blood, into these the blood of necessity flows, - - from the hollow vein into the right, and from the venous artery into the left; because these two vessels are always full of blood, and their orifices, which are turned towards the heart, cannot then be closed.
Vladimir started, for in his veins the lust of passion had welled until it had reached boiling point.
In his veins, though, flowed the blood of the best of a race of mighty fighters, and back of this was the training of his short lifetime among the fierce brutes of the jungle.
And so she did bleed him, but the vein she opened was not one of those that lie close and blue beneath the skin; deeper she cut than that, for she opened one of those veins through which the bright red blood runs leaping from the heart.
He has said some things in Pascal's vein not unworthy of Pascal.
A true fissure vein, or I never saw one," he proclaimed softly.
When the man was dead an examination disclosed the unmistakable marks of an animal's fangs deeply sunken into the jugular vein.
Such occasions, however, rarely occur and are perhaps not characteristic of Hesiod's genius: if we would see Hesiod at his best, in his most natural vein, we must turn to such a passage as that which he himself -- according to the compiler of the "Contest of Hesiod and Homer" -- selected as best in all his work, `When the Pleiades, Atlas' daughters, begin to rise.
And here we shall of necessity be led to open a new vein of knowledge, which if it hath been discovered, hath not, to our remembrance, been wrought on by any antient or modern writer.
There is this to be said for your shy, cautious man, that on the rare occasions when he does tap the vein of eloquence that vein becomes a geyser.
There was excellent blood in his veins --royal stuff; though sadly vitiated, I fear, by the cannibal propensity he nourished in his untutored youth.
His firm lips met like the lips of a vice; the Delta of his forehead's veins swelled like overladen brooks; in his very sleep, his ringing cry ran through the vaulted hull, Stern all
He folded his arms, tightly pressed in his lips, but a whole volcano of bitter feelings burned in his bosom, and sent streams of fire through his veins.
In the stillness and the darkness, the knowledge that I was in deadly danger took to itself deeper and deeper meaning all the time; a something which was realization crept inch by inch through my veins and turned me cold.
it is the duty of each who has Saxon blood in his veins.