A flump sucker is a person who incoheriantly constantly sucks cocks. Can refer to any gender or age as long as they're a cock sucking ass-hole.

Also a great way of insulting without swearing in order not to get wrong at school or in front of parents.
Person1: Oh my god, here comes John again.

Person2: Maybe people would like him if he wasn't such a flump sucker.
by Skii May 06, 2005

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