Boy you're so buttoned up, its not funny.
Lighten up, dude and check out these suffix-skis:
http://home.earthlink.net/~dlarkins/slang-pg.htm
Who uses Jazz slang these days?
Not many people unless you are into Jazz and hang out with that inner circle.
Also, what does "butski" mean even in Jazz slang?
As for joking around:
Well, I believe there is a proper way to do that. But using words that could be taken the wrong way is not one of them.
For me, if the roles were reversed, and I was in his shoes, I would apologize for using a word that is not commonly understood by many.
If my intention was to be harmful in any way and then I were to turn around and say that I was joking, then that would not be good.
For the BIble says,
18 "Like a maniac shooting flaming arrows of death
19 is one who deceives their neighbor and says, “I was only joking!”
20 Without wood a fire goes out; without a gossip a quarrel dies down."
(Proverbs 26:18-20).
So if the word was in any way an insult, it would be like shooting arrows that were on fire at me.
But even if his intention was not without any kind of malice, the Bible tells us to be clear in our speech with others.
For Paul says he would rather speak 5 words with the understanding than 10,000 words without the understanding (1 Corinthians 14:19).
The fact that he is still not explaining what the word or words actually means concerns me.
The Bible says,
36 "But I say unto you, That every idle word that men shall speak, they shall give account thereof in the day of judgment.
37 For by thy words thou shalt be justified, and by thy words thou shalt be condemned"
(Matthew 12:36-37).
...
