Citations:OMGer

Noun: "(Internet, slang) a person who uses the expression OMG (oh my God)"

 * 2012, Dahlia Kurtz, "National UnFriend Day calls on Facebookers to cull their lists", 24 Hours (Vancouver, Canada), 19 November 2012:
 * The talk show host created the now international day of action in 2010. From the start it was a huge success, as Kimmel said on his show: “We killed off millions of LOLers and OMGers.”