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.
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.