This is my very first contribution to this forum, so please be kind and patient. It took me a while to put my ideas in order. 
Term: (A word or expression you have seen in writing)
sexting noun (portmanteau of sex and texting)
Your definition or explanation:
The act of sending and receiving sexually suggestive or explicit text messages, often containing pictures or other audiovisual material.
Example: (An example of the term in use)
Check these two examples (spoken):

P.S. Oh wait! Wikipedia does not count as a dictionary, does it? You can find an explanation about the meaning of sexting here: http://en.wikipedia.org/wiki/Sexting
And there is also a definition in the Urban Dictionary, here: http://www.urbandictionary.com/define.php?term=sexting
Term: (A word or expression you have seen in writing)
sexting noun (portmanteau of sex and texting)
Your definition or explanation:
The act of sending and receiving sexually suggestive or explicit text messages, often containing pictures or other audiovisual material.
Example: (An example of the term in use)
Check these two examples (spoken):
One or more places you have seen the term: (Please give URLs/links to web pages, or a full description of a print publication.)ANNOUNCEMENTS JULIE-CHEN: We all know the dangers of sexting where teenagers text provocative photos of themselves. A picture of two Pennsylvania teens in their bras ended up on a classmates cell phone. Now, fifteen-year-old Marissa Miller and her friend face child pornography charges, but they're suing to stop the charges from being filed.
Date: 2009
Title: For March 28, 2009, CBS
Source: CBS_Early
KOTB: And also, I know that some parents are worried about this, their kids are sexting. They are texting and sending pictures kind of, you know, just--what are they called? Evocative pictures of themselves.
Date: 2009
Title: Current events, inauguration discussed
Source: NBC_Today
Davies, Mark. (200The Corpus of Contemporary American English (COCA): 400+ million words, 1990-present. Available online at http://www.americancorpus.org.
In an unusual legal case arising from the increasingly popular practice known as “sexting,” six Pennsylvania high school students are facing child pornography charges after three teenage girls allegedly took nude or semi-nude photos of themselves and shared them with male classmates via their cell phones.
‘Sexting’ surprise: Teens face child porn charges
6 Pa. high school students busted after sharing nude photos via cell phones
By Mike Brunker
Projects Team editor
msnbc.com
updated 7:03 p.m. MT, Thurs., Jan. 15, 2009
http://www.msnbc.msn.com/id/28679588/
Have you looked for this term or meaning in dictionaries, and not found it? YesLast fall, the National Campaign to Prevent Teen and Unplanned Pregnancy surveyed teens and young adults about sexting — sending sexually charged material via cell phone text messages — or posting such materials online.
Her teen committed suicide over ‘sexting’
Cynthia Logan’s daughter was taunted about photo she sent to boyfriend
By Mike Celizic
TODAYshow.com contributor
updated 8:26 a.m. MT, Fri., March. 6, 2009
http://today.msnbc.msn.com/id/29546030/
P.S. Oh wait! Wikipedia does not count as a dictionary, does it? You can find an explanation about the meaning of sexting here: http://en.wikipedia.org/wiki/Sexting
And there is also a definition in the Urban Dictionary, here: http://www.urbandictionary.com/define.php?term=sexting
Last edited: