"arigatou," or "thank you." But not really - because what you're really doing, is trying to sound cute and/or sexy by breaking the word down into all of its syllables. This is done in an attempt to seduce the person(s) hearing the phrase.
Me: "Here Ms. Applewaters, your sink has been fixed."
You: "Oh Mr. Plumber, a-ri-ga-to-ou"
70's electro porn pop starts playing in the background
...
You: "Oh Mr. Plumber, a-ri-ga-to-ou"
70's electro porn pop starts playing in the background
...
by The Great Shrimpini February 17, 2019