Fook is the shortened form of the world's most popular social networking site, Facebook. For those who don't like using unnecessar syllables, Fook is a much simpler way of referring to the website. Can be used as a noun or verb, depending on the situation.
Erik: What did you end up doing last night?
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!