If you mean slang as in internet slang, then it means "Certified Old Fart".
Garrett mean in cockney slang
Slang is slang It's the s' "LANG " uage.
In old slang, milkshake mean butt.
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.
An angle of 230 degrees is a reflex angle.
It is slang for having sex.
he means what does being a sponge mean in slang
Dough is a slang word for money.
In slang, "soup" can refer to something that has been enhanced or improved, such as adding more power to a car (souping up a car). It can also be used to describe something that has been embellished or exaggerated, like a story that has been souped up to make it more interesting.
''Dill'' means ''idiot'' as australian slang.
Tat is also slang for tattoo