Hmmm…I’m not really a smiley person. Or let’s just say I’m really unaware of their variety, types and effects. Most of the times I have no clue what people mean when they just randomly place colons, semicolons, apostrophe and other seldom-used characters in the English language. So, I did what every person who belongs to this era does, when in doubt, GOOGLE.
Found this amazing list. http://www.webopedia.com/quick_ref/textmessageabbreviations_02.asp
It means, put your money where your mouth is!