Ach

A word used to signify a mistake; Typically used among the youth.

The CH is pronounced the Welsh Way.

"So, remember that time where I told you We went on a roller coaster?"
"Ach, I meant a Roller skate..."

Ackies

An Informal word used when you make a mistake; Typically used by the Youth.

"So, What;s your favourite film?"
"Ackies, I meant What's your favourite film!"