a celebratory hand slapping gesture between two persons given horizontally as opposed the vertical high five. Rarely do the thumbs meet, so technically a pie four but still called a pie five for the sake of simplicity. In math, the high five and the pie five are related. The end nodes of the high five are all vertical (29, 47, 77) while the "pie" numbers are neatly tucked inside the high five and are aligned horizontally. They are 33, 42, 54 and 69; the difference between them is 9, 12 and 15, a Pythagorean Triple. The word "pie" in this definition stands for "Pythagorean". Pie also has a connotation of meaning "random" or "different" and is implied in this definition since the pie five is basically an alternate way of doing a high five. Frequently used in the context of successfully arranging a date with someone nice - "a sweetie pie".
Two good friends meet. "I just asked the hottest girl in school out and she said, 'Yes.'" "You @sshole... pie five!" (Horizontal hand slap.)
by tgifrydei December 27, 2014
by lesbenson November 9, 2013