When a female inserts a stick of butter inside her vaginal cavity. OR When a female is so wet, its slick like melted butter
Example 1 - Friend 1:"Hey man, howd she butter that piece of bread, were on the subway?"

Friend 2:"buttered clam"

Example 2 - Friend 1 "I met this chick at the bar, and I knew she was in to me, but I didn't realize how into me she was, until I started having sex with her, it was like a buttered clam"
by bdizthebiz April 19, 2015
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