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1.
A woman's vagina. Typically, you eat out a clamwich. "Clam" comes from the slang that means a vagina, and "wich" comes from "sandwich", which is something you typically eat.
Guy 1: Man, I just LOVE nice, warm, moist clamwiches.
Guy 2: Who doesn't?
by anon, bitches. May 25, 2008
 
2.
The opposite of a manwich
a threesome involving one guy and two girls
Evan: Dude I had an awesome threesome last night
Daryl: What a manwich you fag?
Evan: Nah bitch, a clamwich
by ficklepickleticklefucker June 25, 2010