Originated from a sleazy looking MSN emoticon, which had eyebrows that animated up an down as a gesture of "I'm horny", "Sexy", "Ooooh baby", etc.

It was commonly used in MSN group conversations, that was 'attended' by a group of 'The Veronicas' fans- TVMB.

The name came from it's most common user, who's name is Emily.
She is pretty hot. *emsizz*
"Nice picture, you have nice boobies! *emsizz*"
by JessOIsBisexual December 7, 2007
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