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Means (male) masturbation. Propably due the following joke: Two men walk into a toilet. While man #1 starts pissing, man #2 starts counting numbers aloud. 1, 2, 3, 4..., 5, 6, 7. Man #1: What were those numbers all about? Man #2: You see boy, I like to keep things organized. When I say 1, I unzip the zipper. When I say 2, I take my dick out. When I say 3, I pull back the foreskin. When I say 4, I piss. When I say 5, I pull forth the foreskin. When I say 6, I put my dick back in my underwear. And when I say 7, I zip the zipper. But the next day, the two men go back to the bathroom, and suddenly the man starts yelling in the bathroom 1, 2, 3,5,3,5,3,5,3,5,3,5,3,5!!!