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1.
1. Someone who is socially awkward

2. Someone who is cansidered lame
Why is your cousin being such a wet sandwich?
by Cameryn Bradley Hughes April 28, 2010
 
2.
Referring to an awkward or unintelligible comment made by another, usually either under the influence or between the hours of 3 and 6 in the morning.
"I have a banana in my pocket, it's so all that is that thing, you know?"
"No, I don't know, that was such a wet sandwich."
by Lee Bens March 25, 2009
 
3.
A pussy
Dude stop being such a ******* pussy your totally being a wet sandwich about the whole thing.
by Mr. Meatballs April 19, 2010
 
4.
A sexual act in which the male shoves a Subway footlong Turkey Club sandwich into the female's vagina and fucks her through it.
"Hey, have you given her the Wet Sandwich yet?"
by pfa January 06, 2009