riiuuyöaie

Noun

 * 1) plan for a dating night intention of doing something in the night when dating someone
 * 2) an intent to woo at night

Usage notes
This word is sometimes cited as the Finnish word that contains the largest number (9) of consecutive vowels, but there's little evidence of it ever being actually used as other than curiosity. This word seems to first appear in the internet in about 2008 to challenge the earlier winner which "only" contains seven consecutive vowels.