When a computer application or hardware design feature has unintended or sometimes embarrassing consequences.
Getting Feature Fucked commonly occurs in word processing and email applications. For example you type a message that uses a misspelled version the word “incidentally” but the auto correct feature fixes it and it becomes “indecently”.
Very often this behavior occurs during important correspondences, such as with ones boss, can have undesirable consequences when the unintended word fits the sentence structure but drastically changes it meaning.
Can also occur in voice recognition applications. For example the scene in Wild Hogs where “Alternate Spec’s” is interpreted as “Alternate Sex”