It means special Education, Usually used to say your stupid or not acting dumb.
'The car sped' is using the past tense of speed. The car was speeding down the street, so the car sped.
The past participle of "sped" is "sped."
If you mean slang as in internet slang, then it means "Certified Old Fart".
Sped is the preterit,( I sped) past conditional ( I would have sped), and plusperfect (I had sped) of the verb speed.
imp. & p. p. of Speed., of Speed
Slang is slang It's the s' "LANG " uage.
In old slang, milkshake mean butt.
Doki is a Japanese expression for a sped-up heartbeat .
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.