Slack-ma-Girdle is an old variety of cider apple formerly widely grown in the South-West of England.

[1] Slack-ma-Girdle is most often found in orchards in Devon, where it probably originated, though it was also planted in southern Somerset, Dorset and elsewhere.

The fruit tends to have a flattened shape, greenish yellow skin, and a striped red flush which often has a distinctive bluish tinge.

[3] Like many other Devon varieties, it is classed as a "sweet" type in the standard classification of cider apples, being low in tannin and acid.

[4] Hogg was not impressed with Slack-ma-Girdle's vintage qualities, stating that it had "not much merit" as a cider apple.