YYUR, YYUB, ICUR, YY4me

Found this note in an old (very old) school yearbook -- waaaay before twitters and tweets. Will Espy called it “ABC Language” in the 1970s; it mimics what folks keep kvetching about -- shortcutting the English language. Well, it's hard to say where this started, but today's twitterers' grandparents — maybe great-grandparents even — knew about it. Figure out this one — and send me the answer:

AB,  F  U  NE X?
S  V  F  X.
F  U  NE  M?
SV  F  M.
OK  L  F  M  N  X