After being berated by her parents who find her 'language' too difficult to understand, a schoolgirl has come up with a guide to teenage slang so her parents could understand her better.

After writing "The A-Z of Teen Talk," 13-year old Lucy van Amerongen, from Box in Gloucestershire, is now "stoked" (very happy) because sales of her "nang" (cool) book are "owdish" (excellent).

"I hope the book clears up confusion. Some parents don't give teenagers enough credit for some of the words they use. More come up every day and a lot are very creative," said the young van Amerongen, who goes to Cheltenham Ladies' College.

Lucy's guide book includes 300 teen words such as "antwacky" (unstylish), "cotch down" (sleep), "rago" (OK) and "zip" (yob).

On top of the new "vocabulary" Lucy's book also includes a "three-golden teen talk rule," never make eye contact when talking to a "mouldie" (parent), always mumble inaudibly, and try to include "like" in every sentence.

Lucy claims she came up with the idea while on a holiday with her father Victor, 52, mother Amanda, 54, and sisters Amii, 23, and Rosie, 11.

"The guide sheds light on the strange mumbo-jumbo of teenagers' talk," Victor said.

Lucy's guide book was an instant hit prompting Sussex-based publishers Ravette to snare publishing rights.

So far, 3,000 of the guide books have already been sold already with an updated edition already in the planning stage.