1.is used refer to any member of a large family of catfish native to Central and South America that posess sucker shaped mouths that are often introduced to aquariums to eat algae.
2. used to refer to a very low, scummy individual, a "bottom feeder".
1.I had a pleco in my 10G tank, but he outgrew it.
2. that guy is a total pleco, he asked my married sister to do it with him.
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