Phrase used to describe a woman (she) that may either choose or appears to dress like a man (him)- 'She-Him' (Shim).
Can also be used to refer to a lack of female behaviour or characteristics and instead evidence to those similar of a man.
Jesus dude Im sure that new cleaner is a 'Shim'
by Chris French December 11, 2006
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Derived from the italian word "scemonito" meaning a fool, retart,etc..
THAT GUY1: you guys made me wait outside for 2 hours
THOSE GUYS: Sorry we were eating some bracciole
THAT GUY1: You guys are a bunch of shims
by Ant Anthem September 10, 2006
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When one cannot tell whether or not a person is a she or a he.
Look at that person. Is that a man or a woman? Im pretty sure its a shim.
by gnarsbars78 December 2, 2009
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A male, usually fat, hairy, and prone to playing everquest 16 hours a day, who pretends to be a female while on the internet. Shims allow for roleplaying to be taken to a sexual level while playing video games, and sometimes practice while cybering with random guys in teen chatrooms.
DARK WIZARD: yo wassup

SweetElfChic: hey hunny ;) *flirts*

DARK WIZARD: omg ur really a girl? let's get our characters married and have hot online sex ;) ;) ;)

RETARDEDCHILD: You fucking faggot. You're about to cyber with a shim.
by IEATLIVEPUPPIES April 28, 2005
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1. She/Him - A homosexual male/female parading around, mascarading as the opposite sex.
1. That trick was hot, so I started feeling her up. Then I noticed she had a buldge in here crotch. OMG! it was a SHIM.
by Noodlz March 5, 2003
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used as a direct object, a person. Someone whose sexual identity cannot be identified even after a prolonged conversation.
"Hey, did you meet that new guy at work today?"

"Guy? I thought he was a chick. Name's Leslie."

"Huh, must be a shim."
by neatoness August 30, 2009
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a he-she.
I saw a shim outside the restrooms and wondered which one it would actually use.
by Dickey Hoskins October 30, 2002
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