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1.
Typically a northeast term describing lesbians.
"Boy did you see Lisa and Laurie last night? Those two clam slappers sure can pound buckets of brew."
by Matt Corbinowitz January 26, 2006
 
2.
The definition of a Clam Slapper is when two dykes in initiate vaginal rubbing.
An example of a Clam Slapper is any lesbian activity that occurs due to vaginas rubbing, smacking or clapping of any sort.
by Bluntman3456 January 17, 2011