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1. When a flaccid penis begins to move on its own.

2. A normal situation or conversation that becomes ridiculous, strange or outrageous.
Bill: "hey Jim how's the wife doing?"

Jim: "She's pretty good, got more hours at work and she's started this Facebook page for newly divorcees. She has such a kind heart supporting those girls"

Bill: "Dude that's just cocksidious"

"My cocksidious phone keeps autocorrecting my texts into Irish!"
by NoTillies June 23, 2017
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