A key part of the fun in reading Angus, Thongs, and Full-Frontal Snogging and On the Bright Side, I'm Now the Girlfriend of a Sex God is the language. The use of slang, description, and dialogue engages the reader and adds to the humor. Rennison has made British slang popular with American readers, and each book offers a glossary (by Georgia) at the end to explain such terms as "fringe" (bangs) and "gorgey" (gorgeous).

Some terms are common British terms and some have been created by British teens or Georgia herself. Adolescents love to create their own language, declaring their growing independence from the adult world while using pop culture for their, own purposes. Such language also enables teens to be part of the group and to entertain one another with their wit. An example from both books is "wet—A drippy, useless, nerdy idiot...