This term could have a few different meanings:
1. Refers to the act of sucking fuck juices.
2. Refers to the act of collecting fuck juices, adding a hardening agent, a little sugar and making a sucker and/or lollie pop.
3. Refers to a vampiric man/creature that sucks fuck.
4. A deraugatory term that doesn't make a whole lot of sense.
1. After have sex, the man goes down and slurps up the juices. Woman: "Yeah, you're bad little fuck sucker aren't you? Suck that fuck juice!"
2. "Want to go to the store and grab some fucksuckers?"