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1.
A message sent on myspace, an email, text message, aim, ect. that has sexual content. Usually sent from a male who has sexual feelings for a female.
ryan12: Hey wats up?
clair85:nmu?
ryan12: nmj jacking off to you myspace picture.
clair85: wtf CREEP!!!
ryan12: I lov the one where your in a bathing suit and you can kinda see your nipple. DAMNNN!!!
( clair12 has blocked you from her buddy list.)

later that day...
Clair: OMG Ryan sent me the grosest sex message today!!
Julie: OMG! what a perv!
by Emma Tom April 19, 2007
 
2.
a text message that is sexual and is usually intended to get a sexual response
dude, stop sending sex messages your girl friend when im here, thats for your privite time only!
by bostonfan January 30, 2009