The earliest known usage of fook in its modern form is generally credited to "KMan" in an IRC conversation in which he repeatedly wrote fook every time he lost a round in Half Life. The final count was 96. (2001)
Contrary to intellectual assumptions, the term fook has no foriegn origin and was spelt as it was meant to be stated.
Invalid usage (in terms of definition) of fook may be in the general form:
"I fooked her good. Real Good."
*Eric gets demoted in CoD* "Fook"
*Marty fails his AP Chemistry test* "Fook"
To f'ook someone is to Facebook them (abbreviation), but cheekily suggests you also did something different to them, although you can stand to correct the person if they question what you said.
I'll f'ook ya later when I get a spare minute ok?
Zack: Not much, just Fooked that new guy in our bio class for a couple hours and that twelve year old down the street.
Erik: Sweet dude! I love Fooking strangers!
Mom: What are you doing in there?