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1.
When you decide to refrain from talking, txting, IMing, etc. a guy for at least two days unless he talks to you first to prevent looking desperate or stalker-like.
Katie: "God, I like Josh so much"
Sarah: "No waay"
Katie: "Should I talk to him?"
Sarah" "Nah girl give it the two day rule"
by damion. March 16, 2009
 
2.
The method of swooning the female into submission by implementing a mobile communication routine that allows conversation to become more interesting by only conversing bi-daily, thus completing the task above.
"Hey, Glen, did you text that girl tonight?"

"Nah, bro, I'm using the two day rule. That way, we have a full day's worth of shit to talk about."

"Nice man, you'll be diving in that shit in a week!"
by EagerBeaver137 October 28, 2014