(medicine, neurology) A rare neurological movement disorder, related to cystic lesions and swelling of the third ventricle in the brain, in which patients, usually children around age 3, begin to bob the head and shoulders involuntarily back and forth or from side to side.

A medical disorder where weakness of the muscles at the back of the neck causes the chin to sink downward.

(sports, pathology, slang) A concussion or subconcussive injury caused by tobogganing, including luging, skeleton, bobsledding, tubing; that stereotypically leaves the victim woozy or muddle-headed.

Third-person singular simple present indicative form of head-hop

present participle of head-hop

An attempt to psychologically manipulate. / A mental pursuit

To psychologically manipulate; to gaslight.

(slang) Indicating that a person is very foolish, or making a stupid decision.

plural of head-scratching.

plural of head scratching (alternative form of head-scratchings).