### GolfScript, 82 characters ###
"What does ",2円-,{)..10/10%1=!10円%`"123"\?)*"thstndrd"2/=+}%", "*" 'o' stand for?"
Works even for >100 'o's, [test it online](http://golfscript.apphb.com/?c=Oydsb29vb29vb29vb29vb29vb29vb29vb29sJwoKIldoYXQgZG9lcyAiXCwyLSx7KS4uMTAvMTAlMT0hXDEwJWAiMTIzIlw%2FKSoidGhzdG5kcmQiMi89K30lIiwgIioiICdvJyBzdGFuZCBmb3I%2FIgoK&run=true).