Someone who is not altogether in the mental sense; nevertheless someone who can be considered a blundering dumbass.
Dude 1: Why is that guy rolling little pieces of crap into shapes?
Dude 2: I believe he is "a few sandwiches short of a picnic" better let him be.
by Nameless Here Forevermore February 14, 2006
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Someone who is not altogether in the mental sense; nevertheless someone who can be considered a blundering dumbass.
Dude 1: Why is that guy rolling little pieces of crap into shapes?
Dude 2: I believe he is "a few sandwiches short of a picnic" better let him be.
by Nameless Here Forevermore February 17, 2006
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a) a term for a girl who has both performed and received oral sex and lost her anal virginity, but is still vaginally virgin.

b) a hilarious term for a guy who has masturbated and watched porn, but who has never neither had oral or anal sex performed on him nor penetraded a girl's vagina with his member.
m4w CL posting :

im looking for virgins to help me deflower myself, but lol im also looking for a one sandwich short of a picnic girl, like myself. since everybody, or almost, masturbates and/or watches porn today, and giving and receiving oral and anal sex, i dont consider that losing one's virginity

reply to ad: im the girl you are looking for, im one sandwich short of a picnic myself; we'll get along just fine as an nsa-fwb ltr.
by Sexydimma December 15, 2012
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When someone forgets to pack all the sandwiches for a picnic. Doesn't that really piss you off.
Oh dear Giselle, I'm afraid that we are a few sandwiches short of a picnic, we will just have to manage on caviar and champange.
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When someone is missing a marble or two, or one beer short of a six pack, basically and idiot who isn’t all there
“That guy can’t tie his own shoelace.” “He must be a sandwich short of a picnic.”
by Dank farts August 22, 2019
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Not the sharpest tool in the box; scatter brained; squirrel thinking.
"I think I am going insane with you"
"No, you are just a couple sandwiches short of a picnic"

"They are a couple sandwiches short of a picnic because they never focus"
by MGSuperstar July 2, 2023
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