Top definition
Like Incest but requires you to go back in time to fuck your ancestors.
Two people on ancestry.

Person one: "Hey! Where have you been? I haven't seen you in a while."

Person two: "Time travelling to fuck my ancestors"

Person one: "Eww, That's incest!"

Person two: "No it's not, It's Ancest"
by Dr.Deadstone December 15, 2010
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