7
Definitely in no way related to Hetalia, it refers to what a character from the webcomic Homestuck sounds like in their heads
Oh gog Octopimp's voices have so much headcanon in them
by AeromanDVance November 25, 2011
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8
Used by many Hetalia fags to describe something that hasn't yet happened in original canon but has happened in their head.

i.e. Their own personal canon.
My headcanon says that Momma America was Native American actually
by shounenrobo April 08, 2010
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9
An extreme act of oral sex on a penis.
She said she was good at blow jobs, but that girl straight up headcanon-ed me.
by jk_unicorn May 07, 2019
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