Top Definition
When you "accidentally" slip an object (usually a laser gun) between somebodies two butt cheeks.
Guy- "WTF, you just gave me a slippery Tiernan!"
Other Guy- "Sorry, it was an accident."

Guy- "Hehe. I just gave you a Slippery Tiernan."
Loose Girl- "Really? I didn't even notice."
by anonymous1234246623465 May 25, 2011
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