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A tip off is a handy piece of information given by one to another. Tip-offs have been used in history (see the examples).
Regular tip-off;
"Look out Bill, he's a Queer."

Historical tip-off;
"Look, here, Hitler has said Peace in our time!"
"Nah, bollocks nev, he's a Queer."
by Jeffrey Douglas November 23, 2006
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2
When two men have erections in normal settings, such as school or at the office, and they bump into each other while walking and touch penises.
My friendship with Jones changed forever.

What happened?

...A tip-off...

Wow, that must have been a hard time. I mean a rough time.
by Hot Cats December 20, 2013
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4
Another name for the top off the cranium or top of head.
Bob takes off his hat to reveal a bald spot. John replies "man what happened to your tipoff", "put that hat back on".
by Rctiger November 23, 2006
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