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1 definition by Gerard w

1. A person who, as a result of frequenting clubs and other such locales, becomes devoid of dignity, civility, and class.

2. A person, who, on account of promiscuity, has become crass and lude.

Originates in Tolstoy's Anna Karenina book 7 wherein he uses the analogy that a slosher is someone like a hard-boiled egg which has been turned over too many times and has become cracked, and unappealing.
"Selena is such a slosher, she Clubs every fucking weekend!"
by Gerard w January 17, 2008