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The female equivelant of febass. It's a combination of the words "feet" "clam" and "ass". The way to distinguish this from fass or febass is:
1. The presence of females
2. Being able to pick out the sweaty clam smell from the other smells.
When Jen got home from her basketball game she smelled like straight feclass.
by Gamblar December 09, 2006