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1.
A single hair that grows on a female's chin overnight. Curly, and resembling a pigtail.
"I don't have a beard, but I do have a boing boing."
by Sir Boingus of Boing July 13, 2013
 
2.
A rash you get between your legs near your balls after going swimming at the beach
I have been at the beach all day, My boing boing is killing me.
by Spinksy November 03, 2007