On the Rat is a more glorified example of On the Rag except in this case the test subject is not wearing a pad, or rag for the case, no, instead a tampon. The Rat comes into it because the string looks like a cute rodent tail hanging out.
Henry- "Man she dropped them jeans and I couldn't believe it. Her tampon fell out too!

Steve- "No way! She was On the Rat"?

Henry- "Yeah. Still did her though"
by The_Def_Master December 03, 2013

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