Dude2="Yeah they shouldn't have assumed all the stuff would get done for them"
Dude1="Well you know what happens when you assume."
Dude2="Yeah, you get your face fucked."
Dude1="FYF mother fucker".
F.Y.F. is derived from telling somebody "to take a step back and literally fuck your own face"
Rob: "Well you can go F.Y.F."
An angry and pissed off Tom Cruise would respond with: "Now I want you to take a step back... and literally fuck your face!"
"Why don't you go and fyf?"
b) the morning of a friday, where one realizes how much entertainment the upcoming weekend has to offer.