This is a name for a some guy's girlfriend. Typical guy who calls his girlfriend 'em' is a real beta-male, skinny, has no self-esteem and has a really unmanly whiny voice. That girl he calls 'em' is pretty likely to be his only girlfriend. He is also prejudiced that he can get any girl, based on credential that he thinks she has.
funny friend :) she has mega hyper turns and love lilo and stitch. there, see, i mentioned stitch. anyway, clowns arnt her best friend but that very much dead evil dark lord monkey might be. flying monkeys rule. want some tomacco?
em: VMDEDLM did a purple shit over there.
me: eww. hey look! flying monkeys!
em: cool!!
me: want some tomacco?
em: wohoo!