"Let me fix that for you."
Used on
internet forums when
one takes it upon oneself to edit or correct somebody's
words/images/material/whatever, usually with comical results.
Guy: Hey
man, look at this cool Ed Hardy hat I bought!
Other guy: lmftfy... "Hey
man, look at this douchebag hat I wasted my
money on! I'm gonna wear it while I f*** my cousin!"