A euphemism for when you can't say "cocksucker
(s)." Typically used around mixed company or elder relatives you don't want to offend. Originates from Rooster (cock) and a suckerfish. Useful because the same word can apply to singular or plural targets.
"Did you hear what Jeff did yesterday?"
"He went up to a guy in a wheelchair and started skipping around him, and then ran off."
<easily offended person walks into the room>
"What a roosterfish!"
<Reading mail with company over, IRS says you have to pay in this year>