This is a generally condescending move on par with tea-bagging, and - if executed properly - causes considerable distress on the recipient's end. Do not attempt this on someone that is physically stronger than you because they will perceive it as a sign of great disrespect.
"Dude, knock it off or I'll spunk you."
Post 2 (spam): I don't know her, can you give me more details? -usually with a linked signature
Post 3: Know who? The person that made the apple pie?
The author of Post 3 got Spunked