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A pun referring to the element in the periodic table Holmium, which has the symbol Ho. This can be used as a sly comment for calling someone a Ho.
"yeah? well your girlfriend has 67 protons."
by mwahahahaha9630 November 08, 2009

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Basically, a girl wth 67 protons is a Ho. It can be used in discreet ways.

This refers to the 67th element on the Periodic Table of the Elements (holmium) which has the short form of Ho.
Person1: Hey look at Carley over there.
Person2: Now there's a girl with 67 protons.
Carly: Hey you guys. What are you talking about?
Person1: Chemistry
by $e9a November 16, 2009

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