An explicit generalised name for something (be it person, place, object or otherwise) you can't remember the actual name of at the moment in time, during a conversation.
(Object)
Dave, pass me the uh... uhm... Fuckslice.
(Place)
Yeah, we took a long trip to... Fuckslice? - off of the main road...
(Person)
Oh I remember him, his name was... John... Fuckslice.
1. The act of complimenting someone harshly, albeit truthfully (in said fuckliment-giver's eyes).
2. Attempting to compliment someone, but royally screwing it up in the process and making it soundlike an unintentional insult.
Comes from combining the terms: Fuck-Up & Compliment
Person 1: "You don't look as fat as you did yesterday."
Person 2: "...Yeah, thanks for the fuckliment."