I think the slang you are talking about is "SNM" which means: Say no more.
in games SMN can sometimes stand for summon, or summoner
If you mean slang as in internet slang, then it means "Certified Old Fart".
There are no stars that I am aware of named "SMN". The nearest star to Earth is Proxima Centauri, and the next-closest stars are the binary pair Alpha Centauri and Beta Centauri.
SMN Gold Musk
Micheal Paine-Hile is the greatest sailor that ever lived with in the Royal Australian Navy. His is the definition of heroic and a fantastic sailor. He will long be remembered and carried on by SMN Jenkinson and SMN Simpkin
Slang is slang It's the s' "LANG " uage.
In old slang, milkshake mean butt.
It is slang for having sex.
Dough is a slang word for money.
he means what does being a sponge mean in slang
Cool itself, unless you are using it to mean mildly cold, is a slang word. Just because it is old slang doesn't mean that it is not still slang.
Tat is also slang for tattoo