@RIcko The site seems to redirect to pc.net .. This should work for you.

on $*:text:/^@acro\s(.+)$/iS:#: {
  if (!%F) { inc -u4 %F
    if ($sock(acro)) sockclose acro
    sockopen acro pc.net 80
    sockmark acro $+(/slang/meaning/,$remove($regml(1),$chr(32))) msg #
  }
}
on *:sockopen:acro: {
  sockwrite -n acro GET $gettok($sock(acro).mark,1,32) HTTP/1.1
  sockwrite -n acro Host: $+($sock(acro).addr,$str($crlf,2))
}
on *:sockread:acro: {
  var %acro | sockread %acro
  if ($regex(%acro,/<th class="right">(.+?)</th>/)) { 
    $gettok($sock(acro).mark,2-,32) Meaning: $regml(1) 
  }
}