Gruntle

grunt + -le("early modern English frequentative suffix")

Full definition of gruntle

Verb

1. (obsolete) To utter small, low grunts.
2. (obsolete) To complain; to grumble

back-formation from disgruntled

Verb

1. (humorous) To humour; to induce the opposite effect of causing a person to become disgruntled.

Usage notes

To gruntle is not in normal usage. It has gained a certain currency amongst information security specialists to describe a process whereby the negative feelings of a disgruntled user might be reduced, or positive feelings induced.