A conflation of "fuck you" and "sucked in".
Hence, a more offensive way of saying "sucked in".
Keith: "Oh dude.... that shit was so scary I shat myself..."
*Heinrich Keith's arch nemesis overhears his toil*
Heinrich: "Fucked in you no business foreign in secure muthafucka!
*Rakeem witnesses George slip face first into a huge pile of dogshit*
Rakeem: "Fucked in you sack of shit!"