FML
means Fix My Lighthouse. Back in the 17th Century, lighthouse keepers were the butt of everyone's jokes. When a lighthouse keeper was made fun of, his retort would be "why don't you fix my lighthouse!" which was shortened over time to FML. This term was made famous in the great battle of the Sole Bay in 1902 where 14 people died and 1 person broke their glasses.
"if you are going to take the piss out of me then why don't you FML!
FMyLife is an English-language blog that serves as "a recollection of everyday anecdotes likely to happen to anyone". Posts on the site are short, user-submitted stories of unfortunate happenings that begin with "Today" and end with "FML"