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1.
(verb) A penis thrusting into a vagina in a rapid and often vicious manner. Usually done from a standing position, or in a position where only the genitalia are in contact.
Felta and Favreau went double team clam stabbing on that switch hitting duo in da Port.
by Antenna Wilde February 14, 2008
 
2.
Male to female vagina intercourse.
Rob did some serious clam stabbing in his day.
by Fav December 01, 2006