"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
...
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
Precedes or follows either a gratuitously disrespectful or honest remark, originated in New York City. Used in similar fashion to "no offense" or "to be honest," interchangeably.
Ya mans is wild buns, respectfully. Respectfully he's washed.
After school, The Modells on Jamaica Ave was active. Respectfully.