A man that cannot get his dick to become hard, and instead only flops around.
When you get to a certain age, most guys cannot get hard and instead end up with a silly willie!
by B.A47 February 12, 2009
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When a person licks their finger, a'la a wet willy, but instead of slipping it in your ear, goes right for your butt hole.
"Dude, why did I hear you scream so loud last night?"

"That douche nugget, Pete, gave me a silly willy."
by M.TOMP April 26, 2009
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girl: Youre my funny goober.
Guy: Well, youre my silly willy.
by Greg Bennett August 6, 2006
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Just know that if your doctor says you have it, you are seriously fucked. see panda madness.
Holy shit honey, that man has the silly willies!
by Harry Truman April 6, 2008
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This is when a guy is getting head from a girl, and right before he is about to ejaculate he pulls out and sticks his wet dick in the girls ear and then blows his load in it.
Jack pulled out of Jill's mouth and gave her a Silly Willy.
by Sean January 21, 2005
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"Ah god don't give me a silly willy!"
by submison February 22, 2009
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Those REALLY horny kids in games like Minecraft who always flirts with people, as well as spam hundreds of overused emojis and emoticons like 'XD'.
That damn silly willy be playin' Minecraft all day. Making us cringe so much holy shit.
by 1ob December 19, 2017
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