Several "Ooo's" add atmosphere to a situation, this could be shock, fear or happiness. People also use this term to indicate that they have recently acknowledged something.
If you mean slang as in internet slang, then it means "Certified Old Fart".
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
''Dill'' means ''idiot'' as australian slang.
Potted is slang for very drunk.
BTM is a slang acronym for "Be There Moment."
That is not slang, it is a clear plastic sheet.