An altercation of the word like, used by individuals who feel that typing an extra letter is unecessary, and feel the cause of doing so is not worthy in the result of sounding half intelligent.
A good way to make fun of ignorant fools without them ever knowing it because they're too stupid to figure it out.
If you can't spell "like", do the world a favor and just stop writing.
"Lyk, oh my god, I gained a whole POUND! I weight 85 lbs. now!!!"