1. one who sucks feces
2. term used to describe a fish who sucks debris off of surfaces as a food source.
3. a term used to describe someone who is generally unfavorable.
I put the poopsucker in my aquarium and it wasted no time to get right to sucking the shit.
The act of putting a tube in your rectum and putting the other end in someone else's and taking a diarrhea dump while both giggling hysterically as the poop is being transferred from ones anus to another.