Acronym for "visible penis outline," as in, the outline of his penis is visible through his trousers.
"omg did you see that hot guy over there? VPO. and it's huge."
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Violent pinch off. This occurs when taking a shit and one's b-hole inexplicably contracts.
"Ben was growing a wonderful toilet tail until a VPO ruined it all!"
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Saad : bro I literally just bought 24 cookies
Me: omg you on that vpo shit