L.C.L.Y. is actually, in
chinese "lan si, lan yong", which means a big lousy show-off when he/she knows when he/she can't do
something within his/her capability. This word is commonly used among asians or chinese
people when gossiping.
It's also used to describe someones attitude whereby it also matches his/her face and personality.
eg, there were
two gals and her pals were gossiping... that
david ar, so damn L.C.L.Y.. He shows off his bicycle tricks and now look at him! he landed in hospital already. It really matches his face and his personality.