Originally M.I.A was used in war's when a soldier was "missing in action". However, nowadays it can also be used to say "I was away for a while"
There is also a song named M.I.A by Why Don't we Which is also a TOTAL bop...
Jack Avery from why don't we: "CAUSE I-I-I-I been MISSING OUT ON YOU"
Daniel Seavey from Why Don't We: Cause I-I-I-I been M.I.A on you"
"news reporter : there HAS REPORTDADLY A SOLDIER WHO IS NOW M.I.A"