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A fish who is promiscuous with both other fish and people. This term is used to insult those who you feel do not need a vicious insult but still require some level of insulting

Not an aggressive insult, more of a playful one
Omg he is such a slagfish for stealing my egg


you are a slagfish Sarah....to which Sarah would reply thanks, love you too
by creativeminds May 09, 2011