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A lady, often but not uniquely, of Catholic education who engages in the time honoured Girls' School pastime of clamjousting. It is the noble martial art of clam-to-clam combat, where one girl grinds her clam against her opponent's. (aka Tribadism)

The collective noun is 'TILT' (From the medieval tournaments consisting of a number of jousts.)
"A tilt of clamjousters"

See also: boxgrazer, dieseldyke, mingeeta, rugmuncher, WRAC.
"That dorm has seen so much clamjousting the matresses squelch with fannybatter"
by Cutaway August 17, 2004
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2
Used to describe a lady who likes ladies, derived from the act of rubbing their pussies together.
by Funky the Monkey April 03, 2006
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3
Did you know that she is a clam jouster
by Rob October 31, 2003
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