Start with the simplest thing: get rid of the extra liquid. If your disposable has a removable mouthpiece (many do), take it off and tap it on a tissue. You'll usually see a few drops come out. That's the pooled e-liquid. Do the same for the airflow holes at the base—wipe them with a dry tissue. This clears the blockage and often stops the gurgle immediately.

If your device doesn't have a removable mouthpiece, just wipe the outside and the airflow holes as best you can. Sometimes just a good wipe is enough.