Switched on

Abbrev. "Brain switched on".

Someone who is switched on is alert and intelligent.

That Ohlsson seems really switched on. I think he has a lot of potential.

by Jackson Flames April 03, 2007

Hedera

Abbrev. Head error. Vulgar. Someone with a mental retardation or learning difficulty. Used by British youths as "txt speak".

"Oh bother", said Pooh as he saw how angry Tigger was.
"LOL he wuz lookin @me liek he'd got a hedera", said Christoper Robin.

by Jackson Flames December 24, 2008