It is to be used to emphasize oath.

"Foath" Fucking Oath
Jim: Bro I nailed the hottest chick the other day.

George: Foath
by UpptyPillow August 5, 2012
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combination of "fuck" and "oath", hence "Foath"
Person 1: that chick is awesome
Person 2: foath!
by LOBSHA~ October 1, 2003
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