When you try to make your presence known to someone by waving or nodding, the the recipient either ignores or does not realise. You have just been pied. This is the perfect time for a friend to suggest that you wipe your face, because it's covered in pie.
Two people passing one another,

"hey man how's it..." as the other person didn't realise and looked the other way; he has accidentally pied his friend/colleague.
by BEARMANTOOTH December 15, 2010
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Abbreviation for private investigator. Often hired by people to get information of somebody else's activities or to solve crimes that the police for one reason or another won't investigate themselves.
"I had to hire a PI to find out who killed my friend."
by IceWarm June 19, 2004
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According to my friend whose parents went to MIT, there's a cheer there that goes "3.14159 SECANT TANGENT COSINE SINE!" Just goes to show ya, if you ever go to MIT you will be labeled a nerd for eternity.
'3.14159 secant tangent cosine sine' says my geometry teacher enthusiastically
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The Greek name for WHO’s next-in-line Covid-19 variant of concern, which is one mutation away from Omicron—a viral christening by WHO could push math teachers, students, and parents worldwide to take up arms against them.
With the word “pi” being used by millions of math students and teachers every day, what are the chances that Pi would be as lucky as Xi, the Greek letter that wasn’t used to coin a Covid-19 variant—which was begging to be picked up—because it’s a popular name among certain ethnic peoples, not to say, the surname of a present president of a state?
by Fasters April 13, 2022
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The name a math geek, whose pet name is “Spider-man,” gave to his tarantula pet, who loves to show his illegally acquired exotic possession wherever he goes to impress and frighten his audience.
Pretty hairy Pi never fails to be the center of attention in public squares.
by Fasters February 10, 2022
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1. The 16th Letter of the greek alphabet.
2. Approximatley 3.142 with many other digits to follow. Used in mathematics to find the area or circumference of a circle.
People who go to great lengths to copy and paste the first 1000 and something digits of pi are very, very sad.
by kittee July 11, 2004
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