Dropping the g

One of the speech habits widely thought of as 'lazy' or 'slovenly' is the realisation of '-ing' when it occurs as the ending of a present participle or a verbal noun not as IPA: /ɪŋ/ (the correct pronunciation), but as IPA: /ɪn/, i.e., as if the ending were '-in'. This pronunciation is widely thought of nowadays as a speech habit of the uneducated, and is often shown in such representations as "Flippin' 'eck!" (for "Flipping heck!", a mild informal exclamation). Note that in this example, the 'h' is dropped as well as the 'g' (see dropping the h).

At the beginning of the last century, it was more commonly part of an upper class drawl. Rich gentlemen (more often than ladies) were caricatured as belonging to the "Huntin', shootin' and fishin' set."

In general, to drop one's 'g's is felt, in academic circles, to be informal, to the point of being bad manners. If you are learning English as a foreign language, try not to be tempted to do as so many young natives do. Aim to speak more carefully!